2 5*x + 4*x + 7
5*x^2 + 4*x + 7
2 7 + 4*x + 5*x
7 + 4*x + 5*x^2
/ ____\ / ____\ | 2 I*\/ 31 | | 2 I*\/ 31 | |x + - + --------|*|x + - - --------| \ 5 5 / \ 5 5 /
(x + 2/5 + i*sqrt(31)/5)*(x + 2/5 - i*sqrt(31)/5)
7 + x*(4 + 5*x)
7.0 + 4.0*x + 5.0*x^2