Question: It has to be an interval that satisfies both increasing and concave up thank uuu!:) Given the function f (x) = 3x3 + 9x2 -
It has to be an interval that satisfies both increasing and concave up thank uuu!:)

Given the function f (x) = 3x3 + 9x2 - 72x, determine all intervals on which f is both increasing and concave up
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