Originally Posted by
ahawk1 In order to do this problem, u first have to find the derivative of f(x). So u find the derivative of f(x), f'(x)=2*4x^(2-1)-1*5x^(1-1) which gives u f'(x)=8x-5. Once you have this just plug in 2 into the f'(x) equation which gives you 16-5=11