26. Show work please.

Question 26 5 pts Show all your work on paper and upload it in the Assignment named: Exam 2 File Upload no more than 15 minutes right after you submit this test. For the function f(x) = 2x5 -21x2+2: (a) Find the critical numbers of f (if any): (b) Find the open intervals where the function is increasing or decreasing; and (c) Apply the First Derivative Test to identify all relative extrema. Then use a graphing utility to confirm your results