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Suppose the second derivative of f is given by f'' ( x ) = 40 x 2 ( x + 9) 9 ( x 2

Suppose the second derivative of f is given by f''(x) = 40x²(x + 9)⁹(x² + 9). 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 ________

f is concave down on __________

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