1. The problem statement, all variables and given/known data y =x4(2x-5)6 2. Relevant equations Product Rule & Power of a Function Rule 3. The attempt at a solution y = x4(2x-5)6 y' = 4(x)3(1)(2x-5)6 + x4(6)(2x-5)5(2) y' = 4x3(2x-5)6 + 12x4(2x-5)5 The answer is: 20x3(2x-5)5(x-1) No idea where they get the 20x3 or the (x-1). If I were to factor my answer, I still wouldn't get that, I think.