What is the integral of xe^-x?

Grimertop90

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?

quasar987

Try integration by parts.

HallsofIvy

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

*Count Iblis*

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

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Grimertop90	What is the integral of xe^-x? Tweet 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?

quasar987 Recognitions: Gold Member Homework Help Science Advisor	Try integration by parts.

HallsofIvy Recognitions: Gold Member Science Advisor Staff Emeritus	Let u= x, dv= e^-xdx.

Count Iblis	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.