XX + yy-2x-2y + 3 proves that no matter how many values XY takes, the answer is not positive

XX + yy-2x-2y + 3 proves that no matter how many values XY takes, the answer is not positive

xx+yy-2x-2y+3
=(x^2-2x+1)+(y^2-2y+1)+1
=(x-1)^2+(y-1)^2+1
>0
No matter how many values XY takes, the answer is positive