9. Consider the following function f (x) = , I 2+12 (a) Find f'(z) and then determine the critical points K Cont. AMAT 112 Exam 2 Page 6 of 8 (b) Determine the intervals where f is increasing and decreasing. State the (r, y) points for any of the local extrema. (c) Find f"(x) and then determine the intervals where f is concave up and concave down. If there are inflection points, then state them