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Find the values of x such that f(x)=2x...

Find the values of x such that
`f(x)=2x^(3)-15x^(2)-84x-7` is a decreasing function.

A

`-2 lt x lt 7`

B

`2 lt x lt 7`

C

`x lt -2`

D

`x gt7`

Text Solution

Verified by Experts

The correct Answer is:
A
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