Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = x2 - 8x - 20
A. Increasing on (4, ?); decreasing on (-?, 4)
B. Increasing on (- 4, ?); decreasing on (-?, - 4)
C. Increasing on (-?, - 4); decreasing on (- 4, ?)
D. Increasing on (-?, 4); decreasing on (4, ?)
Answer: A
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a. 
b. 
c. 
d. 
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