Mathematics

Mathematics

Problem

Consider the function f(x)=x4−4x3f(x)=x^{4}-4x^{3}. For which values of xx is the graph of ff both decreasing and concave up? a) (0,2)(0,2) b) (−∞,0)∪(3,∞)(-\infty,0)\cup(3,\infty) c) (−∞,0)∪(2,3)(-\infty,0)\cup(2,3) d) (2,∞)(2,\infty)

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