Let . On which of the following intervals is strictly…

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

Problem

Let f(x)=x3−6x2+9x+5f(x)=x^{3}-6x^{2}+9x+5. On which of the following intervals is ff strictly increasing? (a) (1,3)(1,3) (b) (−∞,1)(-\infty,1) (c) (−∞,1)∪(3,∞)(-\infty,1)\cup(3,\infty) (d) (1,∞)(1,\infty)

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