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