For which interval the given function \[f(x)=-2{{x}^{3}}-9{{x}^{2}}-12x+1\] is decreasing [MP PET 1993]

\[(-\infty ,\,\,-2)\]and \[(-1,\,\infty )\]

For which interval the given function \[f(x)=-2{{x}^{3}}-9{{x}^{2}}-12

1.	For which interval the given function \[f(x)=-2{{x}^{3}}-9{{x}^{2}}-12x+1\] is decreasing [MP PET 1993]
A.	\[(-2,\,\infty )\]
B.	\[(-2,\,-1)\]
C.	\[(-\infty ,\,-1)\]
D.	\[(-\infty ,\,\,-2)\]and \[(-1,\,\infty )\]
Answer» E.

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For which interval the given function \[f(x)=-2{{x}^{3}}-9{{x}^{2}}-12x+1\] is decreasing [MP PET 1993]

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