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Math Help - [SOLVED] Surds...express with rational denominator

  1. #1
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    [SOLVED] Surds...express with rational denominator

    The question is-
    4 √3 - 2 √2
    7
    √5

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  2. #2
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    Quote Originally Posted by salam View Post
    The question is-
    4 √3 - 2 √2
    7 √5
    I think your question is
     <br />
\frac{4(\sqrt{3}-2\sqrt{2})}{7\sqrt{5}}<br />

    Multiply numerator and denominator with \sqrt{5}
    So the value becomes

     <br />
=\frac{4\sqrt{5}(\sqrt{3}-2\sqrt{2})}{7(\sqrt{5})^2}<br /> <br />

     <br />
=\frac{4(\sqrt{5\times 3}-2\sqrt{2\times 5})}{35}<br />

     <br />
=\frac{4(\sqrt{15}-2\sqrt{10})}{35}<br />

    that's the answer
    Now one more thing, you will find it really better if you learn Latex
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  3. #3
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    Sorry for just posting it up
    i have the answer but i wanna know if the denominator can be simplified caz i got a different denominator to the answer in mu booklet answer.
    My denominator i got was 7 and the book has it as 35. plzz help
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  4. #4
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    thankss alott
    i get how u did it and thanks again and ill surely learn latex ..
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