3. Given f'(x) = 4x3 123:2 complete parts ac. Show all your work to earn full credit. (4 points each} a) Find the intervals on which f is increasing or decreasing. b) Find the x-values (if any) at which f has local maximum or minimum values. If none, write none. c) Find the intervals of concavity and the x-values of the inection points (if any). Answers: a) f increasing: 1'" decreasing: b) local maximum off at: local minimum off at: c) f concave up: 1' concave down: point of inection on f at