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For which interval the given function f(...

For which interval the given function `f(x)=2x^3-9x^2+12x+1` is decreasing? a)`(-2,infty)` b)`(-2,1)` c)`(-infty,-1)` d)`(1,2)`

A

`(-2,infty)`

B

`(-2,1)`

C

`(-infty,-1)`

D

`(1,2)`

Text Solution

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The correct Answer is:
D
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