4 3 2 x - x - x - x - 2
x^4 - x^3 - x^2 - x - 2
(x + 1)*(x - 2)*(x + I)*(x - I)
(((x + 1)*(x - 2))*(x + i))*(x - i)
4 2 3 -2 + x - x - x - x
-2 + x^4 - x - x^2 - x^3
-2.0 + x^4 - x - x^2 - x^3
-2 + x*(-1 + x*(-1 + x*(-1 + x)))
/ 2\ (1 + x)*\1 + x /*(-2 + x)
(1 + x)*(1 + x^2)*(-2 + x)