Let . On which intervals is…

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

Problem

Let f(x)=x3−6x2+9x+7f(x)=x^{3}-6x^{2}+9x+7. On which intervals is ff increasing? (a) (1,3)(1,3) only (b) (1,∞)(1,\infty) only (c) (−∞,1)(-\infty,1) and (3,∞)(3,\infty) (d) (−∞,1)(-\infty,1) and (1,3)(1,3)

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