Tricky u-sub. Can you point me in the right direction?
$u = 5-2x^2$
$ du = -4x dx$
Obviously, this does not match fully.
I tried breaking up the $x^3 = x*x^2$ and I continued with:
$2x^2 = 5-u$
But, I can't see how to make it all fit.
Am I on the right track?