x-y=2x^2-y^2=(x+y)(x-y)=6x+y=3(x+y)^2+(x-y)^2=x^2+2xy+y^2+x^2-2xy+y^2=2(x^2+y^2)=13x^2+y^2=6.5
x - y = 2x^2 - y^2 = 6(x + y)(x - y) = 6x + y = 3x = 5/2y = 1/2x^2 + y^2 = 26/4 = 13/2
101/16
