calculate f ' (1) / / (b) determine where f' (x) = 0. 19. f(x) = x2 5x + 13 ( ) ( ) 22. f(x) = |x+2| 23. f(x)=x3+9x2+6 24. f(x)=x3+3x2+3x1 25 f(x)=x3+2x2+2x1 7 26. f(x) = 29:41 27. f(x )2 x-sin(x ) and 0