Mathematics

Mathematics

Problem

Let f(x)=x4−4x3f(x)=x^{4}-4x^{3}. On which open interval is the graph of ff concave down? a) (−∞,0)(-\infty,0) b) (2,∞)(2,\infty) c) (0,2)(0,2) d) (−∞,2)(-\infty,2)

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