ify the choice that best completes the statement or answers the question. 9. Find f '(x) if f(x) = x' - 2x + 1. a. 31 - 2 C. T - 21 b. 31 - 1 d. I 10. Find f '(2) if f(x) WIN X+1. 3x a. C. I WIN b. 1 d. 11. Find f'(3) if f(x) - (x - 3)( x3 - 2 ). a. -25 C. -1 b. 0 d. 25 12. Find f '(1) if /(x) - + 1][ */x- 1]. a. C. b. d. + 2