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