# Math Help - Integration!!!

1. ## Integration!!!

I havnt done calculus in a while and need help doing this integral... Im pretty sure it has to do with integation by parts but am not sure. <br><br>Integral of&nbsp; x^2e^(-kx)&nbsp; with limits 0 to positive infinity. Thanks!!! <br>

2. Originally Posted by clipperdude21
I havnt done calculus in a while and need help doing this integral... Im pretty sure it has to do with integation by parts but am not sure. <br><br>Integral of&nbsp; x^2e^(-kx)&nbsp; with limits 0 to positive infinity. Thanks!!! <br>
did u mean this?

$\int_0^\infty x^2e^{-kx}dx$

use integration by parts twice..

3. would u=x^2 and dv= the rest for the 1st? Im lost with calculus lol

4. Originally Posted by clipperdude21
would u=x^2 and dv= the rest for the 1st? Im lost with calculus lol
yes..