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Math Help - simple equation

  1. #1
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    simple equation

    Im having difficulty understanding something simple:

    Can someone show me how it is possible to get from

    2aČ = dČ

    to

    d = a√2

    many thanks
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  2. #2
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    Re: simple equation

    Quote Originally Posted by planetdomi View Post
    Im having difficulty understanding something simple:

    Can someone show me how it is possible to get from

    2aČ = dČ

    to

    d = a√2

    many thanks
    Well first of all, that answer is wrong, but anyway...

    \displaystyle \begin{align*} d^2 &= 2a^2 \\ \sqrt{d^2} &= \sqrt{2a^2} \\ |d| &= \sqrt{2}\sqrt{a^2} \\ |d| &= \sqrt{2}\,|a|\textrm{ or, if you like} \\ d &= \pm \sqrt{2}\,a \end{align*}
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  3. #3
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    Re: simple equation

    wow

    Thankyou so much
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