Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = x4 - 8x+2 (a) Find the interval on which f is increasing. (Enter your answer using interval notation.) Find the interval on which f is decreasing. (Enter your answer using interval notation.) (b) Find the local maximum and minimum values of f. local minimum value local maximum value 3= (c) Find the Inflection points. (Order your answers from smallest to largest x, then from smallest to large (x, y): (x, y) = == = Find the interval on which f is concave up. (Enter your answer using interval notation.) Find the interval on which f is concave down. (Enter your answer using interval notation.)