2 2 y + y*x - 3*x
y^2 + y*x - 3*x^2
/ / ____\\ / / ____\\ | y*\1 - \/ 13 /| | y*\1 + \/ 13 /| |x - --------------|*|x - --------------| \ 6 / \ 6 /
(x - y*(1 - sqrt(13))/6)*(x - y*(1 + sqrt(13))/6)
2 2 y - 3*x + x*y
y^2 - 3*x^2 + x*y
y^2 - 3.0*x^2 + x*y
2 - 3*x + y*(x + y)
-3*x^2 + y*(x + y)