Mathematics

Mathematics

Problem

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

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