I've been working on this problem and can't figure out how to get to the right answer.
The problem:
(5x-2)^2(2-x^4)^4
I got:
2(5x-2)(2-x^4)^3(20+16x^3-50x^4)
But the correct answer, according to the online set, is:
2(5x-2)(2-x^4)^3(10+16x^3-45x^4)
I sometimes get tripped up on factoring out, but I can't see where I went wrong. My answer seems right. I don't know how to get to the correct answer.