Mathematics

Mathematics

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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