If f(x) = X5 – 20X 3 + 240X then f(x) is

1.	If f(x) = X5 – 20X 3 + 240X then f(x) is
A.	Monotonically decreasing everywhere
B.	Monotonically decreasing on (0, ∞)
C.	Monotonically increasing only in (-∞, 0)
D.	Monotonically increasing everywhere
Answer» E.

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If f(x) = X5 – 20X 3 + 240X then f(x) is

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