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The interval on which function f(x) = 2x...

The interval on which function `f(x) = 2x^(3)+9x^(2)+12x-1` is decreasing is

A

`[-1, oo)`

B

[-2, -1]

C

`(-oo, -2]`

D

[-1, 1]

Text Solution

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The correct Answer is:
B
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