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Math Help - Can anyone give a meaningful explaination to the below simplification

  1. #1
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    Can anyone give a meaningful explaination to the below simplification

    = 2*(1+s^2)^-2[-2s^2+(1+s^2)]
    = 2*(1+s^2)^-2 (1-s^2)

    I really dont understand how [-2s^2 + (1+s^2)] simplifies to (1-s^2) can anyone explain it please?
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  2. #2
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    Quote Originally Posted by maxmadx View Post
    = 2*(1+s^2)^-2[-2s^2+(1+s^2)]
    = 2*(1+s^2)^-2 (1-s^2)

    I really dont understand how [-2s^2 + (1+s^2)] simplifies to (1-s^2) can anyone explain it please?
    I think you are overthinking this:
    -2s^2 + (1 + s^2) = -2s^2 + 1 + s^2 = -2s^2 + s^2 + 1 = (-2 + 1)s^2 + 1 = -s^2 + 1 = 1 - s^2

    -Dan
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  3. #3
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    oh yeah, now its obvious, thanks a lot!
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