Let . On which interval(s) is…

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

Let f(x)=x3−3x2−9x+2f(x)=x^{3}-3x^{2}-9x+2. On which interval(s) is ff increasing? (a) (−∞,−1)(-\infty,-1) (b) (−1,3)(-1,3) (c) (−∞,−1)∪(3,∞)(-\infty,-1)\cup(3,\infty) (d) (3,∞)(3,\infty)

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