Using the first derivative, find the interval(s) for which f(x) is increasing and decreasing: increasing: (-60, -3] U [1, 00) decreasing: (-3, 1) U (-0, -3) U (1, 00)
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f'(x) = d/dx (12 + 9x - 3x^2) = 9 - 6x Show more…
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