Determine where the function is increasing and where it is decreasing.f(x) = -x2 - 2x + 8
A. increasing on (9, ?)
decreasing on (-?, 9)
B. increasing on (-?, 9)
decreasing on (9, ?)
C. increasing on (-1, ?)
decreasing on (-?, -1)
D. increasing on (-?, -1)
decreasing on (-1, ?)
Answer: D
Mathematics
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