How Do You Find the Integral of xe^-x?

Level: Undergrad
Thread starter Grimertop90
Start date Sep 10, 2008
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Integral

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Grimertop90

Thread starter
Sep 10, 2008

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?

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quasar987

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Gold Member

Sep 10, 2008

Try integration by parts.

HallsofIvy

Science Advisor

Homework Helper

Sep 10, 2008

Let u= x, dv= e^-xdx.

Count Iblis

Sep 11, 2008

You can also compute the intergal of exp(-a x) and then differentiate w.r.t. the parameter a.

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How Do You Find the Integral of xe^-x?

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