Section 4.1: Maximum and Minimum values 1. [5 pts]. Let f(x) = x - 2 . arctan (x). a) (3pts) Find the critical number(s) of the function f. b) (2pts) Find the absolute maximum and minimum values, if any, of f on the given interval [0, 4].4. [3 pts] Suppose the function f(x) = 3x* + ax + bx- has a critical point at x = 2, for which f(2) = -80. Determine a, and b