Mathematics

Mathematics

Problem

Let ff be twice-differentiable for all real numbers with f′′(x)=(x−2)(x+1)f''(x)=(x-2)(x+1). On which of the following intervals is ff concave up? a) (−∞,2)(-\infty,2) b) (−1,2)(-1,2) c) (−∞,−1)∪(2,∞)(-\infty,-1)\cup(2,\infty) d) (2,∞)(2,\infty)

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