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Math Help - Definite Integral

  1. #1
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    Question Definite Integral



    Can anyone explain to me what happened in this step?
    I don't understand mainly where the 2 came from nor the x^(1/2) + x
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  2. #2
    MHF Contributor arbolis's Avatar
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    Because (a+b)^2=a^2+2ab+b^2. (see the " 2ab" part).
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