Mathematics

Mathematics

Problem

Suppose f′′(x)=(x−1)(x+2)f''(x)=(x-1)(x+2) for all real xx. On which of the following intervals is the graph of ff concave down? a) (−∞,1)(-\infty,1) b) (−2,1)(-2,1) c) (−∞,−2)∪(1,∞)(-\infty,-2)\cup(1,\infty) d) (−∞,−2)(-\infty,-2)

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