Answers

2014-08-17T13:18:49+08:00
X^2+4x+4
=x^2+2x+2x+4
=(x^2+2x)+(2x+4x)
=x(x+2)+2(x+2) cancel out x+2 so it wil become x(x+2)+2
=(x+2)(x+2)
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