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3) For each of the following, determine the intervals on which the following functions are concave up and concave down. a) f(x) = x4+ 28x3-

3) For each of the following, determine the intervals on which the following functions are concave up and concave down. a) f(x) = x4+ 28x3- 432x2+56xb) g(x) = 4xe3x+1

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