Find the interval(s) on which the function is increasing.

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

Problem

Find the interval(s) on which the function f(x)=x3−6x2+9x+4f(x)=x^{3}-6x^{2}+9x+4 is increasing. (a) (1,3)(1,3) (b) (−∞,1)∪(1,3)(-\infty,1)\cup(1,3) (c) (−∞,1)∪(3,∞)(-\infty,1)\cup(3,\infty) (d) (−∞,0)∪(4,∞)(-\infty,0)\cup(4,\infty)

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