2 2 64*x - 121*y
64*x^2 - 121*y^2
/ 11*y\ / 11*y\ 1*|x + ----|*|x - ----| \ 8 / \ 8 /
(1*(x + 11*y/8))*(x - 11*y/8)
(-11*y + 8*x)*(8*x + 11*y)
64.0*x^2 - 121.0*y^2