Here :
Hi,
I have to evaluate intergral from -inf, inf of (x^2)(e^(-ax^2))dx.
I am supposed to use the fact that integral from -inf, inf of (e^(-ax^2)) = sqrt(pi/a).
I'm pretty sure you need to to it by parts so that you can get x^2, 2x and 2 and then some form of the other integral. I'm just not sure how to evaluate it.
Thanks