Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = 2x2 + 8x + 0

Question

A. Increasing on (2, ?); decreasing on (-?, 2)
B. Increasing on (-4, ?); decreasing on (-?, -4)
C. Increasing on (8, ?); decreasing on (-?, 8)
D. Increasing on (-2, ?); decreasing on (-?, -2)

Answer 1

Answer: D