Editor
The standard parabolic form of the equation $f(x)=x^{2}+4x+1$ is
Difficulty: Easy
A: 
x(x+4)+1
B: 
$(x+2)^{2}-3$
C: 
$(x+4)^{2}+9$
D: 
$x(x-2)^{2}+1$
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