Question

Simplifique x+(x+y).(x-y)+xysobre x+y
Ficando X+( x+y).(x-y)+xy/x+y

Answer 1

x + (x + y)(x - y) + xy

----------------------------- elimina AMBOS (x + y)

(x + y)

fica

x + (x - y) + xy

x + x - y + xy

2x - y + xy