MonotonicityMedium
Question
The value of a for which the function
(a + 2)x3 - 3ax2 + 9ax - 1 decreases monotonically for all real x, is-
(a + 2)x3 - 3ax2 + 9ax - 1 decreases monotonically for all real x, is-
Options
A.a < -2
B.a > -2
C.-3 < a < 0
D.- ∞ < a ≤ - 3
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