2 z - z + 5
z^2 - z + 5
2 5 + z - z
5 + z^2 - z
/ ____\ / ____\ | 1 I*\/ 19 | | 1 I*\/ 19 | |x + - - + --------|*|x + - - - --------| \ 2 2 / \ 2 2 /
(x - 1/2 + i*sqrt(19)/2)*(x - 1/2 - i*sqrt(19)/2)
5.0 + z^2 - z
5 + z*(-1 + z)