Respuestas

2012-09-10T09:36:34+02:00

x²-14x+y²+12y-4=0

 

x²-2x+y²+2x-14x+12y-4=0

 

(x-y)²-12x+12y-4=0

 

(x-y)²-12(x-y)-4=0

 

(x-y)²-12(x-y)+36-36-4=0

(x-y-6)²-40=0

 

(x-y-6)²-√40²=0

(x-y-6+√40)(x-y-6-√40)=0