Let \[f(x)={{x}^{2}}+4x+1\]. Then

1.	Let \[f(x)={{x}^{2}}+4x+1\]. Then
A.	\[f(x)>0\] for all x
B.	\[f(x)>1\] when \[x\ge 0\]
C.	\[f(x)\ge 1\] when \[x\le -4\]
D.	\[f(x)=f(-x)\] for all \[x\]
Answer» D. \[f(x)=f(-x)\] for all \[x\]

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Let \[f(x)={{x}^{2}}+4x+1\]. Then

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