Mathematics

Mathematics

Problem

For all real xx, let ff be differentiable with f′(x)=(x−1)(x−4)f'(x)=(x-1)(x-4). Define F(x)=∫2xf(t) dtF(x)=\displaystyle\int_{2}^{x} f(t)\,dt. On which interval is FF concave up? a) (1,4)(1,4) b) (1,∞)(1,\infty) c) (−∞,1)∪(4,∞)(-\infty,1)\cup(4,\infty) d) (52,∞)(\tfrac{5}{2},\infty)

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