Find the intervals in which the following functions are strictly increasing or decreasing:
(a) – 2x³ – 9x² – 12x + 1
(b) (x + 1)³ (x – 3)³

Question

Find the intervals in which the following functions are strictly increasing or decreasing:(a) – 2x3 – 9x2 – 12x + 1 (b) (x + 1)3 (x – 3)3

Shiksha Nation · Accepted Answer

(a)  f (x) = −2x3 − 9x2 − 12x + 1(b) f(x) = (x + 1)3 (x − 3)3

Find the intervals in which the following functions are strictly increasing or decreasing:(a) – 2x3 – 9x2 – 12x + 1 (b) (x + 1)3 (x – 3)3