2 2*x - 8
2*x^2 - 1*8
1*(x + 2)*(x - 2)
(1*(x + 2))*(x - 2)
-8.0 + 2.0*x^2
/ 2\ 2*\-4 + x /
2*(-4 + x^2)
2*(-2 + x)*(2 + x)