HW-18-Second-Derivative-Test Section 4.4: Problem 6 Previous Problem List Next (1 point) Suppose that f(x ) =x4 -5x3. (A) Find all critical values of f. If there are no critical values, enter "none" If there are more than one, enter them separated by commas. Critical value(s) = (B) Use interval notation to indicate where f(x) is increasing. Note: When using interval notation in WeBWork, you use INF for co, -INF for -co, and U for the union symbol. . Increasing: (C) Use interval notation to indicate where f(x) is decreasing. Decreasing: (D) Find the x-coordinates of all relative maxima of f. If there are no relative maxima, enter "none". If there are more than one, enter them separated by commas. Relative maxim (E) Find the x-coordinates of all relative minima of f. If there are no relative minima, enter "none". If there are more than one, enter them separated by commas. Relative minima at X = (F) Use interval notation to indicate where f(x) is concave up. Concave up (G) Use interval notation to indicate where f(x) is concave down. Concave down: (H) Find all inflection points of f. If there are no inflection points, enter "none". If there are more than one, enter them separated by commas. Inflection point(s) at x =