The values of ?a? for which the function \[(a+2){{x}^{3}}-3a{{x}^{2}}+9ax-1\] decreases monotonically throughout for all real x, are [Kurukshetra CEE 2002]

The values of ?a? for which the function \[(a+2){{x}^{3}}-3a{{x}^{2}}+

1.	The values of ?a? for which the function \[(a+2){{x}^{3}}-3a{{x}^{2}}+9ax-1\] decreases monotonically throughout for all real x, are [Kurukshetra CEE 2002]
A.	\[a<-2\]
B.	\[a>-2\]
C.	\[-3<a<0\]
D.	\[-\infty <a\le -3\]
Answer» E.

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The values of ?a? for which the function \[(a+2){{x}^{3}}-3a{{x}^{2}}+9ax-1\] decreases monotonically throughout for all real x, are [Kurukshetra CEE 2002]

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