u = x^3 +28 du = 3x^2dx
which is where the 1/3 comes from
integral 0f U^1/2 is 2/3U^3/2 so your coefficient is 2/9
I've been trying to finish my hw on web assign, but can't get this problem right. I've tried reading my book, but so far as I can tell I'm doing it the way it says to. I also checked by differentiation, and I thought it was right.
(this is a screencap of the problem, and my solution). Thanks for your help