Solve each of the following problems. After examining the form of the choices, decide which is the best of the choices given. 19. If f ( x) = (x -1)(x2 +2)3, then f' (x) = (A) 6x(x2+ 2)2 (B) 6x(x - 1) (x2 + 2)2 (C) (x2 + 2)2 (x2 + 3x-1) (D) (x2 + 2)2 (7x2 - 6x+ 2) (E) -3(x-1)(x2+2)2 20. Find dy if y = Vx( 3x - 1) dx 9x -1 (A) (B) Nx-1 2Vx 2 3 (C) 3Vx (D) (E) None of these 2Vx