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Suppose the second derivative of f is given by f(x) = -35x7(x - 9)5(x2 + 25). Determine the intervals of concavity of f. Enter your

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Suppose the second derivative of f is given by f"(x) = -35x7(x - 9)5(x2 + 25). Determine the intervals of concavity of f. Enter your answer using interval notation. If an answer does not exist, enter DNE. f is concave up on (00, 0) X f is concave down on X

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