2 2 64*x - 49*y
64*x^2 - 49*y^2
/ 7*y\ / 7*y\ |x + ---|*|x - ---| \ 8 / \ 8 /
(x + 7*y/8)*(x - 7*y/8)
64.0*x^2 - 49.0*y^2
(-7*y + 8*x)*(7*y + 8*x)