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What is the integral of xe^-x?

by Grimertop90
Tags: antiderivative, calculus, exponential, integral
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Sep10-08, 04:42 PM
P: 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?
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Sep10-08, 05:08 PM
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quasar987's Avatar
P: 4,772
Try integration by parts.
Sep10-08, 09:09 PM
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Let u= x, dv= e-xdx.

Count Iblis
Sep11-08, 11:39 AM
P: 2,158
What is the integral of xe^-x?

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

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