Estimate the interval(s) on which the function is increasing and decreasing.f(x) = -3x2 - 5x + 4
A. decreasing on (-?, -0.83); increasing on (-0.83, ?)
B. increasing on (-2.26, -0.83); decreasing on (-0.83, -2.26, ?)
C. increasing on (-?, -2.26); decreasing on (-2.26, ?)
D. increasing on (-?, -0.83); decreasing on (-0.83, ?)
Answer: D
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