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8 Determine where the given function is concave up and where it is concave down. f(x) = -x3 + 5x +4 A. Concave up on

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Determine where the given function is concave up and where it is concave down. f(x) = -x3 + 5x +4 A. Concave up on ( - co, 4), concave down on (4, co B. Concave down on ( - co, 4), concave up on (4, co) C. Concave down on ( - co, 0), concave up on (0, co) D. Concave up on ( - co, 0), concave down on (0, co)

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