1
CBSE 12th Mathematics Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

The interval in which the function $$f(x)=2 x^3+9 x^2 +12 x-1$$ is decreasing is :

A
$$(-1, \infty)$$
B
$$(-2,-1)$$
C
$$(-\infty,-2)$$
D
$$(-1,1)$$
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