Problems 31–40. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

Use a graphing utility to graph f (x) = x⁴ − 3x² + 2x − 1 over the interval [−3, 3]. Then, approximate any local maxima and local minima, and determine where f is increasing and where f is decreasing. Round answers to two decimal places.