2. Consider the function f defined by f (x) = 4x4 + 2x3 - x2 + 1 on the domain [-6, 4], graphed below. 100 -50 - 5 a. Judging from the graph, at approximately what x-values does f have local extrema? b. Judging from the graph, at approximately what x-values does f have inflection points? Use calculus to find the exact x-values where f has local extrema. Show your work. d. Use calculus to find the exact x-values where f has inflection points. Show your work