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Let f(x)=x^(2)+4x+1, then...

Let `f(x)=x^(2)+4x+1`, then

A

`f(x)gt0` for all x

B

`f(x)gt1` when `xge0`

C

`f(x)ge1` when `x le-4`

D

`f(x)=f(-x)` for all x

Text Solution

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The correct Answer is:
C
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