Consider the function f(x) = x 5 − 2x 4 + 3 (a) Find all the critical points of f. (b) Use the First Derivative Test to classify the critical points you found in part (a) as local maxima or local minima or neither. Make sure to show your work. (c) What would be the disadvantage of using the Second Derivative Test in part (b) instead of the First Derivative Test? (d) Find the x-values of the global maximum and global minimum of f on the interval −2 ≤ x ≤ 2.