Textile Engineering > GATE 2017 > Calculus
The function f(x) = x³ - 3x² - 9x + 10 is
A
Increasing in the interval (1,∞)
B
Increasing in the interval (18,1)
C
Decreasing in the interval (-1, 3)
D
Decreasing in the interval (-3,1)

Correct : c

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