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Math Help - Integral of xf(x)dx

  1. #1
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    Question Integral of xf(x)dx

    I tried doing integration by parts, but I end up getting the wrong answer, help?
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  2. #2
    MHF Contributor chiph588@'s Avatar
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    Let  u=x\implies du=dx and  dv=f(x)dx\implies v=\int f(x)dx .

    So we get  \int xf(x)dx = x\int f(x)dx -\iint f(x)dx dx.

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