5x^2-3y^2-(x^2-y^2)-(3x^2+4y^2)=x^2-6y2=(-2)^2-6(-3)^2=4-6*9=-50 |x+2|+(y+3)^2=0 |x+2|=0 (y+3)^2=0 x=-2 y=-3
