I'm not sure about the result.
=(x2-4)(3x2+2x) - (x3+x2)(2x) / (x2-4)2
=(3x4+2x3-12x2-8x) - (2x4 + 2x3) / (x2-4)2
=(x4-12x2-8x) / (x2-4)2
Would this be the simplified first derivative?
Thanks. Now for finding a possible critical value for increasing and decreasing intervals, I would take the numerator = 0. I'm having trouble on how I should go about that. I've looked up information on how to do critical values, but each has you factoring it down into (x-1) type terms. Meanwhile I have, x4-12x2-8x = 0. I can't factor out anything more than x.