8 6 x - x
x^8 - x^6
(x + 1)*x*(x - 1)
((x + 1)*x)*(x - 1)
6 / 2\ x *\-1 + x /
x^6*(-1 + x^2)
6 x *(1 + x)*(-1 + x)
x^6*(1 + x)*(-1 + x)