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    1. Matt Sookikian
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    13. Matt Sookikian

      This is an integration-by-parts problem. The answer is:
      x*ln(x)+C

      This is how you calculate it:

      Integral of ln(x)*dx

      u= ln(x)
      du=1/x*dx
      dv=dx
      v=x

      So by parts: uv-integral of vdu
      = ln(x)*x-integral of x*1/x*dx
      =x*ln(x)-integral of 1*dx
      =x*ln(x)-x+c

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