1. The problem statement, all variables and given/known data Find f'(x)= 16x - x-2 using first principles. 2. Relevant equations x http://img153.imageshack.us/img153/8403/597137697c1f605c7a43d34qz4.png [Broken] 3. The attempt at a solution I used dy/dx and got 2x-3 + 16 but I get something different when I use the formular I attempted several times and I cant get the same answer as the dy/dx. Please need help!!!