Let f(x) = -4x - 8. If h != 0, then the difference quotient can be simplified as (f(x + h) - f(x)) / h = Ah + Bx + C, where A, B, and C are constants. (Note: It's possible for one or more of these constants to be 0.) Find the constants and C. Use the simplified expression to find f'(x) = lim h->0 (f(x + h) - f(x)) / h. Finally, find each of the following: f'(1), f'(2), and f'(3).