differentiation

Question: 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



1) $a < -2$
2) $a > -2$
3) $-3 < a < 0$
4) $-\infty < a\le -3$
Solution: Explanation: No Explanation
Increasing and Decreasing function

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