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If the function f(x)=x^(4)+bx^(2)+8x+1 h...

If the function `f(x)=x^(4)+bx^(2)+8x+1` has a horizontal tangent and a point of inflection for the same value of x, then the value of b is equal to

A

`-1`

B

1

C

6

D

`-6`

Text Solution

Verified by Experts

The correct Answer is:
D
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