Respuesta :

(x-y)^2 +4xy = (x+y)^2

FOIL

x^2 -2xy+y^2 +4xy = (x+y)^2             x^2 -2xy

Combine like terms

x^2 +2xy +y^2 =  (x+y)^2                   x^2 +2xy

Factor

(x+y)^2 = (x+y)^2                                 (x+y)^2  

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