2 z + 2*z + 10
z^2 + 2*z + 10
2 10 + z + 2*z
10 + z^2 + 2*z
(x + 1 + 3*I)*(x + 1 - 3*I)
(x + 1 + 3*i)*(x + 1 - 3*i)
10.0 + z^2 + 2.0*z
10 + z*(2 + z)