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