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Question #16 - (9 points) - For the following function, list the intervals where f(x) is concave up and where it is concave down. Find any points of inflection. Do NOT use a graph to answer the question f(x) =3x +2x-12x3 +5 State interval(s) where graph is concave up : State interval(s) where graph is concave down: List any inflection points