How x^2+y^2+2xy=x+y holesquare
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(x+y) ^2=(x+y) (x+y)
=x^2+xy+yx+y^2
=x^2+2xy+y^2
therefore (x+y) ^2=x^2+2xy+y^2
=x^2+xy+yx+y^2
=x^2+2xy+y^2
therefore (x+y) ^2=x^2+2xy+y^2
Thatsomeone:
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