Let . On which interval is decreasing and concave…

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

Problem

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

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