Trying to simplify $frac{sqrt{8}}{1-sqrt{3x}}$ to be $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$












3












$begingroup$


I am asked to simplify $frac{sqrt{8}}{1-sqrt{3x}}$. The solution is provided as $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$ and I am unable to arrive at this. I was able to arrive at $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Here is my working:
$frac{sqrt{8}}{1-sqrt{3x}}$ = $frac{sqrt{8}}{1-sqrt{3x}}$ * $frac{1+sqrt{3x}}{1+sqrt{3x}}$ = $frac{1+sqrt{8}sqrt{3x}}{1-3x}$ = $frac{1+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x}$ = $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Is $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$ correct and part of the way? How can I arrive at the provided solution $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$?










share|cite|improve this question











$endgroup$












  • $begingroup$
    Please review your computations. There is a least 2 errors.
    $endgroup$
    – mathcounterexamples.net
    Jan 5 at 18:10
















3












$begingroup$


I am asked to simplify $frac{sqrt{8}}{1-sqrt{3x}}$. The solution is provided as $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$ and I am unable to arrive at this. I was able to arrive at $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Here is my working:
$frac{sqrt{8}}{1-sqrt{3x}}$ = $frac{sqrt{8}}{1-sqrt{3x}}$ * $frac{1+sqrt{3x}}{1+sqrt{3x}}$ = $frac{1+sqrt{8}sqrt{3x}}{1-3x}$ = $frac{1+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x}$ = $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Is $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$ correct and part of the way? How can I arrive at the provided solution $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$?










share|cite|improve this question











$endgroup$












  • $begingroup$
    Please review your computations. There is a least 2 errors.
    $endgroup$
    – mathcounterexamples.net
    Jan 5 at 18:10














3












3








3





$begingroup$


I am asked to simplify $frac{sqrt{8}}{1-sqrt{3x}}$. The solution is provided as $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$ and I am unable to arrive at this. I was able to arrive at $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Here is my working:
$frac{sqrt{8}}{1-sqrt{3x}}$ = $frac{sqrt{8}}{1-sqrt{3x}}$ * $frac{1+sqrt{3x}}{1+sqrt{3x}}$ = $frac{1+sqrt{8}sqrt{3x}}{1-3x}$ = $frac{1+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x}$ = $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Is $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$ correct and part of the way? How can I arrive at the provided solution $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$?










share|cite|improve this question











$endgroup$




I am asked to simplify $frac{sqrt{8}}{1-sqrt{3x}}$. The solution is provided as $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$ and I am unable to arrive at this. I was able to arrive at $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Here is my working:
$frac{sqrt{8}}{1-sqrt{3x}}$ = $frac{sqrt{8}}{1-sqrt{3x}}$ * $frac{1+sqrt{3x}}{1+sqrt{3x}}$ = $frac{1+sqrt{8}sqrt{3x}}{1-3x}$ = $frac{1+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x}$ = $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$



Is $frac{1+2sqrt{2}sqrt{3x}}{1-3x}$ correct and part of the way? How can I arrive at the provided solution $frac{2sqrt{2}+2sqrt{6x}}{1-3x}$?







algebra-precalculus






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 5 at 18:11







Doug Fir

















asked Jan 5 at 18:07









Doug FirDoug Fir

3177




3177












  • $begingroup$
    Please review your computations. There is a least 2 errors.
    $endgroup$
    – mathcounterexamples.net
    Jan 5 at 18:10


















  • $begingroup$
    Please review your computations. There is a least 2 errors.
    $endgroup$
    – mathcounterexamples.net
    Jan 5 at 18:10
















$begingroup$
Please review your computations. There is a least 2 errors.
$endgroup$
– mathcounterexamples.net
Jan 5 at 18:10




$begingroup$
Please review your computations. There is a least 2 errors.
$endgroup$
– mathcounterexamples.net
Jan 5 at 18:10










7 Answers
7






active

oldest

votes


















4












$begingroup$

$$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = color{blue}{frac{sqrt{8}cdotleft({1+sqrt{3x}}right)}{1-3x}} = frac{sqrt{8}+sqrt{24x}}{1-3x}$$



$$= frac{sqrt{2^3}+sqrt{2^3cdot3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$



Notice the step I highlighted in blue, which is where you made an error. You have to multiply $sqrt{8}$ to $left(1+sqrt{3x}right)$ completely. You multiplied it by only $sqrt{3x}$ and added $1$, which wasn’t correct.






share|cite|improve this answer









$endgroup$





















    2












    $begingroup$

    Observe that
    $$
    sqrt{8}times (1+sqrt{3x})=sqrt{8}+sqrt{8}times sqrt{3x}
    $$
    and
    $$
    sqrt{8}times sqrt{3}=sqrt{24}=sqrt{4times 6}=2sqrt{6}.
    $$






    share|cite|improve this answer









    $endgroup$





















      2












      $begingroup$

      Well, in rationalizing the denominator, we arrive at the intermediate step $frac{sqrt{8}+sqrt{24x}}{1-3x}$ which simplifies to the provided solution.



      Your error comes in multiplying by the conjugate of the denominator. $sqrt{8}*(1+sqrt{3x})$ becomes $sqrt{8}+sqrt{24x}$.






      share|cite|improve this answer









      $endgroup$





















        1












        $begingroup$

        Write $$frac{sqrt{8}(1+sqrt{3x})}{(1-sqrt{3x})(1+sqrt{3x})}$$ and this is
        $$frac{2sqrt{2}(1+sqrt{3x})}{1-3x}$$






        share|cite|improve this answer









        $endgroup$





















          1












          $begingroup$

          Hints:$sqrt8=sqrt{4×2}=2sqrt{2}.$



          $sqrt24=2sqrt6$. (Why?)



          $(1+sqrt{3x})×(1-sqrt{3x})=1-3x $.






          share|cite|improve this answer









          $endgroup$





















            1












            $begingroup$

            You just made some mistakes in your arithmetic.
            $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = frac{sqrt{8}+sqrt{8}sqrt{3x}}{1-3x} = frac{sqrt{2}sqrt{2}sqrt{2}+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$






            share|cite|improve this answer









            $endgroup$





















              1












              $begingroup$

              The second equality is where you mess up - note that
              $$sqrt{8}cdot(1+sqrt{3x})=sqrt{8}+sqrt{8}cdotsqrt{3x}$$
              by the distributive property of real numbers






              share|cite|improve this answer











              $endgroup$













                Your Answer





                StackExchange.ifUsing("editor", function () {
                return StackExchange.using("mathjaxEditing", function () {
                StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
                StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
                });
                });
                }, "mathjax-editing");

                StackExchange.ready(function() {
                var channelOptions = {
                tags: "".split(" "),
                id: "69"
                };
                initTagRenderer("".split(" "), "".split(" "), channelOptions);

                StackExchange.using("externalEditor", function() {
                // Have to fire editor after snippets, if snippets enabled
                if (StackExchange.settings.snippets.snippetsEnabled) {
                StackExchange.using("snippets", function() {
                createEditor();
                });
                }
                else {
                createEditor();
                }
                });

                function createEditor() {
                StackExchange.prepareEditor({
                heartbeatType: 'answer',
                autoActivateHeartbeat: false,
                convertImagesToLinks: true,
                noModals: true,
                showLowRepImageUploadWarning: true,
                reputationToPostImages: 10,
                bindNavPrevention: true,
                postfix: "",
                imageUploader: {
                brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
                contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
                allowUrls: true
                },
                noCode: true, onDemand: true,
                discardSelector: ".discard-answer"
                ,immediatelyShowMarkdownHelp:true
                });


                }
                });














                draft saved

                draft discarded


















                StackExchange.ready(
                function () {
                StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3062999%2ftrying-to-simplify-frac-sqrt81-sqrt3x-to-be-frac2-sqrt22-sqrt%23new-answer', 'question_page');
                }
                );

                Post as a guest















                Required, but never shown

























                7 Answers
                7






                active

                oldest

                votes








                7 Answers
                7






                active

                oldest

                votes









                active

                oldest

                votes






                active

                oldest

                votes









                4












                $begingroup$

                $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = color{blue}{frac{sqrt{8}cdotleft({1+sqrt{3x}}right)}{1-3x}} = frac{sqrt{8}+sqrt{24x}}{1-3x}$$



                $$= frac{sqrt{2^3}+sqrt{2^3cdot3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$



                Notice the step I highlighted in blue, which is where you made an error. You have to multiply $sqrt{8}$ to $left(1+sqrt{3x}right)$ completely. You multiplied it by only $sqrt{3x}$ and added $1$, which wasn’t correct.






                share|cite|improve this answer









                $endgroup$


















                  4












                  $begingroup$

                  $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = color{blue}{frac{sqrt{8}cdotleft({1+sqrt{3x}}right)}{1-3x}} = frac{sqrt{8}+sqrt{24x}}{1-3x}$$



                  $$= frac{sqrt{2^3}+sqrt{2^3cdot3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$



                  Notice the step I highlighted in blue, which is where you made an error. You have to multiply $sqrt{8}$ to $left(1+sqrt{3x}right)$ completely. You multiplied it by only $sqrt{3x}$ and added $1$, which wasn’t correct.






                  share|cite|improve this answer









                  $endgroup$
















                    4












                    4








                    4





                    $begingroup$

                    $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = color{blue}{frac{sqrt{8}cdotleft({1+sqrt{3x}}right)}{1-3x}} = frac{sqrt{8}+sqrt{24x}}{1-3x}$$



                    $$= frac{sqrt{2^3}+sqrt{2^3cdot3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$



                    Notice the step I highlighted in blue, which is where you made an error. You have to multiply $sqrt{8}$ to $left(1+sqrt{3x}right)$ completely. You multiplied it by only $sqrt{3x}$ and added $1$, which wasn’t correct.






                    share|cite|improve this answer









                    $endgroup$



                    $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = color{blue}{frac{sqrt{8}cdotleft({1+sqrt{3x}}right)}{1-3x}} = frac{sqrt{8}+sqrt{24x}}{1-3x}$$



                    $$= frac{sqrt{2^3}+sqrt{2^3cdot3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$



                    Notice the step I highlighted in blue, which is where you made an error. You have to multiply $sqrt{8}$ to $left(1+sqrt{3x}right)$ completely. You multiplied it by only $sqrt{3x}$ and added $1$, which wasn’t correct.







                    share|cite|improve this answer












                    share|cite|improve this answer



                    share|cite|improve this answer










                    answered Jan 5 at 18:27









                    KM101KM101

                    5,9261523




                    5,9261523























                        2












                        $begingroup$

                        Observe that
                        $$
                        sqrt{8}times (1+sqrt{3x})=sqrt{8}+sqrt{8}times sqrt{3x}
                        $$
                        and
                        $$
                        sqrt{8}times sqrt{3}=sqrt{24}=sqrt{4times 6}=2sqrt{6}.
                        $$






                        share|cite|improve this answer









                        $endgroup$


















                          2












                          $begingroup$

                          Observe that
                          $$
                          sqrt{8}times (1+sqrt{3x})=sqrt{8}+sqrt{8}times sqrt{3x}
                          $$
                          and
                          $$
                          sqrt{8}times sqrt{3}=sqrt{24}=sqrt{4times 6}=2sqrt{6}.
                          $$






                          share|cite|improve this answer









                          $endgroup$
















                            2












                            2








                            2





                            $begingroup$

                            Observe that
                            $$
                            sqrt{8}times (1+sqrt{3x})=sqrt{8}+sqrt{8}times sqrt{3x}
                            $$
                            and
                            $$
                            sqrt{8}times sqrt{3}=sqrt{24}=sqrt{4times 6}=2sqrt{6}.
                            $$






                            share|cite|improve this answer









                            $endgroup$



                            Observe that
                            $$
                            sqrt{8}times (1+sqrt{3x})=sqrt{8}+sqrt{8}times sqrt{3x}
                            $$
                            and
                            $$
                            sqrt{8}times sqrt{3}=sqrt{24}=sqrt{4times 6}=2sqrt{6}.
                            $$







                            share|cite|improve this answer












                            share|cite|improve this answer



                            share|cite|improve this answer










                            answered Jan 5 at 18:10









                            Olivier OloaOlivier Oloa

                            108k17176293




                            108k17176293























                                2












                                $begingroup$

                                Well, in rationalizing the denominator, we arrive at the intermediate step $frac{sqrt{8}+sqrt{24x}}{1-3x}$ which simplifies to the provided solution.



                                Your error comes in multiplying by the conjugate of the denominator. $sqrt{8}*(1+sqrt{3x})$ becomes $sqrt{8}+sqrt{24x}$.






                                share|cite|improve this answer









                                $endgroup$


















                                  2












                                  $begingroup$

                                  Well, in rationalizing the denominator, we arrive at the intermediate step $frac{sqrt{8}+sqrt{24x}}{1-3x}$ which simplifies to the provided solution.



                                  Your error comes in multiplying by the conjugate of the denominator. $sqrt{8}*(1+sqrt{3x})$ becomes $sqrt{8}+sqrt{24x}$.






                                  share|cite|improve this answer









                                  $endgroup$
















                                    2












                                    2








                                    2





                                    $begingroup$

                                    Well, in rationalizing the denominator, we arrive at the intermediate step $frac{sqrt{8}+sqrt{24x}}{1-3x}$ which simplifies to the provided solution.



                                    Your error comes in multiplying by the conjugate of the denominator. $sqrt{8}*(1+sqrt{3x})$ becomes $sqrt{8}+sqrt{24x}$.






                                    share|cite|improve this answer









                                    $endgroup$



                                    Well, in rationalizing the denominator, we arrive at the intermediate step $frac{sqrt{8}+sqrt{24x}}{1-3x}$ which simplifies to the provided solution.



                                    Your error comes in multiplying by the conjugate of the denominator. $sqrt{8}*(1+sqrt{3x})$ becomes $sqrt{8}+sqrt{24x}$.







                                    share|cite|improve this answer












                                    share|cite|improve this answer



                                    share|cite|improve this answer










                                    answered Jan 5 at 18:11









                                    GnumbertesterGnumbertester

                                    1675




                                    1675























                                        1












                                        $begingroup$

                                        Write $$frac{sqrt{8}(1+sqrt{3x})}{(1-sqrt{3x})(1+sqrt{3x})}$$ and this is
                                        $$frac{2sqrt{2}(1+sqrt{3x})}{1-3x}$$






                                        share|cite|improve this answer









                                        $endgroup$


















                                          1












                                          $begingroup$

                                          Write $$frac{sqrt{8}(1+sqrt{3x})}{(1-sqrt{3x})(1+sqrt{3x})}$$ and this is
                                          $$frac{2sqrt{2}(1+sqrt{3x})}{1-3x}$$






                                          share|cite|improve this answer









                                          $endgroup$
















                                            1












                                            1








                                            1





                                            $begingroup$

                                            Write $$frac{sqrt{8}(1+sqrt{3x})}{(1-sqrt{3x})(1+sqrt{3x})}$$ and this is
                                            $$frac{2sqrt{2}(1+sqrt{3x})}{1-3x}$$






                                            share|cite|improve this answer









                                            $endgroup$



                                            Write $$frac{sqrt{8}(1+sqrt{3x})}{(1-sqrt{3x})(1+sqrt{3x})}$$ and this is
                                            $$frac{2sqrt{2}(1+sqrt{3x})}{1-3x}$$







                                            share|cite|improve this answer












                                            share|cite|improve this answer



                                            share|cite|improve this answer










                                            answered Jan 5 at 18:12









                                            Dr. Sonnhard GraubnerDr. Sonnhard Graubner

                                            73.6k42864




                                            73.6k42864























                                                1












                                                $begingroup$

                                                Hints:$sqrt8=sqrt{4×2}=2sqrt{2}.$



                                                $sqrt24=2sqrt6$. (Why?)



                                                $(1+sqrt{3x})×(1-sqrt{3x})=1-3x $.






                                                share|cite|improve this answer









                                                $endgroup$


















                                                  1












                                                  $begingroup$

                                                  Hints:$sqrt8=sqrt{4×2}=2sqrt{2}.$



                                                  $sqrt24=2sqrt6$. (Why?)



                                                  $(1+sqrt{3x})×(1-sqrt{3x})=1-3x $.






                                                  share|cite|improve this answer









                                                  $endgroup$
















                                                    1












                                                    1








                                                    1





                                                    $begingroup$

                                                    Hints:$sqrt8=sqrt{4×2}=2sqrt{2}.$



                                                    $sqrt24=2sqrt6$. (Why?)



                                                    $(1+sqrt{3x})×(1-sqrt{3x})=1-3x $.






                                                    share|cite|improve this answer









                                                    $endgroup$



                                                    Hints:$sqrt8=sqrt{4×2}=2sqrt{2}.$



                                                    $sqrt24=2sqrt6$. (Why?)



                                                    $(1+sqrt{3x})×(1-sqrt{3x})=1-3x $.







                                                    share|cite|improve this answer












                                                    share|cite|improve this answer



                                                    share|cite|improve this answer










                                                    answered Jan 5 at 18:13









                                                    Thomas ShelbyThomas Shelby

                                                    2,102220




                                                    2,102220























                                                        1












                                                        $begingroup$

                                                        You just made some mistakes in your arithmetic.
                                                        $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = frac{sqrt{8}+sqrt{8}sqrt{3x}}{1-3x} = frac{sqrt{2}sqrt{2}sqrt{2}+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$






                                                        share|cite|improve this answer









                                                        $endgroup$


















                                                          1












                                                          $begingroup$

                                                          You just made some mistakes in your arithmetic.
                                                          $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = frac{sqrt{8}+sqrt{8}sqrt{3x}}{1-3x} = frac{sqrt{2}sqrt{2}sqrt{2}+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$






                                                          share|cite|improve this answer









                                                          $endgroup$
















                                                            1












                                                            1








                                                            1





                                                            $begingroup$

                                                            You just made some mistakes in your arithmetic.
                                                            $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = frac{sqrt{8}+sqrt{8}sqrt{3x}}{1-3x} = frac{sqrt{2}sqrt{2}sqrt{2}+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$






                                                            share|cite|improve this answer









                                                            $endgroup$



                                                            You just made some mistakes in your arithmetic.
                                                            $$frac{sqrt{8}}{1-sqrt{3x}} = frac{sqrt{8}}{1-sqrt{3x}} cdot frac{1+sqrt{3x}}{1+sqrt{3x}} = frac{sqrt{8}+sqrt{8}sqrt{3x}}{1-3x} = frac{sqrt{2}sqrt{2}sqrt{2}+sqrt{2}sqrt{2}sqrt{2}sqrt{3x}}{1-3x} = frac{2sqrt{2}+2sqrt{6x}}{1-3x}$$







                                                            share|cite|improve this answer












                                                            share|cite|improve this answer



                                                            share|cite|improve this answer










                                                            answered Jan 5 at 18:13









                                                            greeliousgreelious

                                                            19410




                                                            19410























                                                                1












                                                                $begingroup$

                                                                The second equality is where you mess up - note that
                                                                $$sqrt{8}cdot(1+sqrt{3x})=sqrt{8}+sqrt{8}cdotsqrt{3x}$$
                                                                by the distributive property of real numbers






                                                                share|cite|improve this answer











                                                                $endgroup$


















                                                                  1












                                                                  $begingroup$

                                                                  The second equality is where you mess up - note that
                                                                  $$sqrt{8}cdot(1+sqrt{3x})=sqrt{8}+sqrt{8}cdotsqrt{3x}$$
                                                                  by the distributive property of real numbers






                                                                  share|cite|improve this answer











                                                                  $endgroup$
















                                                                    1












                                                                    1








                                                                    1





                                                                    $begingroup$

                                                                    The second equality is where you mess up - note that
                                                                    $$sqrt{8}cdot(1+sqrt{3x})=sqrt{8}+sqrt{8}cdotsqrt{3x}$$
                                                                    by the distributive property of real numbers






                                                                    share|cite|improve this answer











                                                                    $endgroup$



                                                                    The second equality is where you mess up - note that
                                                                    $$sqrt{8}cdot(1+sqrt{3x})=sqrt{8}+sqrt{8}cdotsqrt{3x}$$
                                                                    by the distributive property of real numbers







                                                                    share|cite|improve this answer














                                                                    share|cite|improve this answer



                                                                    share|cite|improve this answer








                                                                    edited Jan 5 at 18:29









                                                                    KM101

                                                                    5,9261523




                                                                    5,9261523










                                                                    answered Jan 5 at 18:15









                                                                    dromastyxdromastyx

                                                                    2,2901517




                                                                    2,2901517






























                                                                        draft saved

                                                                        draft discarded




















































                                                                        Thanks for contributing an answer to Mathematics Stack Exchange!


                                                                        • Please be sure to answer the question. Provide details and share your research!

                                                                        But avoid



                                                                        • Asking for help, clarification, or responding to other answers.

                                                                        • Making statements based on opinion; back them up with references or personal experience.


                                                                        Use MathJax to format equations. MathJax reference.


                                                                        To learn more, see our tips on writing great answers.




                                                                        draft saved


                                                                        draft discarded














                                                                        StackExchange.ready(
                                                                        function () {
                                                                        StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3062999%2ftrying-to-simplify-frac-sqrt81-sqrt3x-to-be-frac2-sqrt22-sqrt%23new-answer', 'question_page');
                                                                        }
                                                                        );

                                                                        Post as a guest















                                                                        Required, but never shown





















































                                                                        Required, but never shown














                                                                        Required, but never shown












                                                                        Required, but never shown







                                                                        Required, but never shown

































                                                                        Required, but never shown














                                                                        Required, but never shown












                                                                        Required, but never shown







                                                                        Required, but never shown







                                                                        Popular posts from this blog

                                                                        1300-talet

                                                                        1300-talet

                                                                        Display a custom attribute below product name in the front-end Magento 1.9.3.8