a. For each function find the average rate of change of f from 1 to x.
b. Use the result from part (a) to compute the average rate of change from x=1 to x=2. Simplify.
c. Find an equation fo the secant line containing (1, f(1)) and (2,f(2)).
Here is where I'm getting stuck mostly. I don't understand how that could be the rate of change of f from 1 to x. I feel that if I can understand part a I can understand the rest of the parts.
I also can't see any way to factor this.
If anybody could help I would be very appreciative.