Question

Vă rog frumos!
$x {}^{2} + y { }^{2} - 2xy + 3x - 3y =$

Answer 1

x²+y²-2xy+3x-3y=x²-2xy+y²+3(x-y)=(x-y)²+3(x-y)=(x-y)(x-y+3)