2 z + 20*z + 100
z^2 + 20*z + 100
2 100 + z + 20*z
100 + z^2 + 20*z
x + 10
100.0 + z^2 + 20.0*z
2 (10 + z)
(10 + z)^2
100 + z*(20 + z)