f(x) = 2x3 − 3x2 − 12x
(a) Use a graphing calculator to draw the graph of f.
(b) (b) Find the domain and range of f. (Enter your answers using interval notation.)
domain

range


(c) State approximately the intervals on which f is increasing and on which f is decreasing. (Enter your answers using interval notation.)
increasing

decreasing

(d) Find all the zeros of f.