15. Sketch y = f(x). Properties are:
Max at P(2, 2) Mins at Q(4, -1), R(-1, 2).
Oblique asymptote y = x - 1.
lim f(x) = 0, lim_f(x) = -[infinity], x--3-
lim f(x) = [infinity], lim f(x) = [infinity], x-3+ x→0-
lim f(x) = -[infinity], lim f(x): x→0+ = [infinity]
x-3 or 0. Draw asymptotes.
As x, y the oblique from below it.