# What is the integral of xe^-x?

by Grimertop90
Tags: antiderivative, calculus, exponential, integral
 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?
 Sci Advisor HW Helper PF Gold P: 4,768 Try integration by parts.
 Math Emeritus Sci Advisor Thanks PF Gold P: 38,877 Let u= x, dv= e-xdx.
P: 2,159

## 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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