This is not a candidate for regular subsitution. There is no x in front of our bracket. In order to use regular substution whatever is in front of the bracket must be 1 order less then the term(s) in the bracket. In this case we would need an X.

You cannt evaluate via this method.

What you can do is integrate by Parts and then on your

Integral let

This should work to get this to a nice integral for yeah