Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = -3x2 + 12x + 36
A. Increasing on (-?, 2); decreasing on (2, -?)
B. Increasing on (-?, 0); decreasing on (0, -?)
C. Increasing on (-2, ?); decreasing on (-?, -2)
D. Increasing on (-?, -2); decreasing on (-2, -?)
Answer: A
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A. 
B. 
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D. 
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