1. The problem statement, all variables and given/known data Find the average rate of change: g(x)=1/x; x = 1, x = a 2. Relevant equations (f(b)-f(a))/(b-a) = Average rate of change 3. The attempt at a solution I've spent far too much time on this problem, but I know I'm making a stupid error and I just can't pin it down. So far, the steps I'm pretty confident about: g(1) = 1/1 = 1 g(a) = 1/a Average rate of change = ((1/a)-1)/(a-1) According to the book the answer is -(1/a)... but I'm just not seeing it.