Mathematics

Mathematics

Problem

Let hh be a differentiable function such that h′(x)=(x−2)(x+1)h'(x)=(x-2)(x+1) for all real xx. On which of the following intervals is hh decreasing? a) (−∞,−1)(-\infty,-1) b) (2,∞)(2,\infty) c) (−1,2)(-1,2) d) (−∞,−1)∪(2,∞)(-\infty,-1)\cup(2,\infty)

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