1. The problem statement, all variables and given/known data y=x2/3(x2-4) 2. Relevant equations 3. The attempt at a solution 1.y'=2/3x-1/3(x2-4)+x2/3*2x 2.y'=2x2-8+2x5/2/3(x1/3) the book agrees with my unsimplified (#1)derivative but it goes further to simplify the equation as y'= 8x2-8/3(x1/3) I can't see how they got 2(x2-4)+x2/3*2x to be 8x2-8 in the numerator. Would someone explain this to me?