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What is the integral of xe^-x?

  1. Sep 10, 2008 #1
    I feel really dumb for not remembering this.... I'm drawing a total blank as to the antiderivative of xe-x or how to find it. Do I need to use a u substitution?
  2. jcsd
  3. Sep 10, 2008 #2


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    Try integration by parts.
  4. Sep 10, 2008 #3


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    Let u= x, dv= e-xdx.
  5. Sep 11, 2008 #4
    You can also compute the intergal of exp(-a x) and then differentiate w.r.t. the parameter a.
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