x ^ { 2 } + 4 x = ( x ^ { 2 } + \frac { 4 } { 2 } x ) + \frac { 4 } { – InterviewSolution

1.	x ^ { 2 } + 4 x = ( x ^ { 2 } + \frac { 4 } { 2 } x ) + \frac { 4 } { 2 } x
Answer» x^2+4x=x^2+4x+4-4=(x+2)^2-(2)^2=(x+2+2)(x+2-2)=(x+4)x

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