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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$\displaystyle \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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