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Thread: Integration by substitute problem

  1. December 31st 2007, 02:42 AM #1
    tabularasa
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    Integration by substitute problem

    I have function which I have to solve with substitution rule:


    I try to substitute u = x +1


    When I get:


    I know the answer, Integration function is:


    But I don't get it, what is wrong with my substitution?
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  2. December 31st 2007, 03:05 AM #2
    Plato
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    \frac{{\left( {u - 1} \right)^2 - 1}}{{\sqrt u }} = \frac{{u^2 - 2u}}{{\sqrt u }} = u^{\frac{3}{2}} - 2u^{\frac{1}{2}}
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