MonotonicityHard
Question
Function y = x4 is-
Options
A.increasing throughout
B.decreasing throughout
C.decreasing in (0, ∞) and increasing in (-∞, 0)
D.increasing in (0, ∞) and decreasing in (-∞, 0)
Solution
y = x4
= 4x3
so it increasing (0, ∞) and decreasing (-∞, 0)
= 4x3 so it increasing (0, ∞) and decreasing (-∞, 0)
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