Question: Please help solve the following question Suppose the second derivative of f is given by f(x) = 20x4(x + 3)7(x2 + 16). Determine the intervals

Please help solve the following question

Suppose the second derivative of f is given by f"(x) = 20x4(x + 3)7(x2 + 16). 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 X f is concave down on X
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