3 2 x + x + 16*x + 16
x^3 + x^2 + 16*x + 16
(x + 1)*(x + 4*I)*(x - 4*I)
((x + 1)*(x + 4*i))*(x - 4*i)
2 3 16 + x + x + 16*x
16 + x^2 + x^3 + 16*x
/ 2\ (1 + x)*\16 + x /
(1 + x)*(16 + x^2)
16 + x*(16 + x*(1 + x))
16.0 + x^2 + x^3 + 16.0*x