2 - x + 3*x - 4
-x^2 + 3*x - 4
/ ___\ / ___\ | 3 I*\/ 7 | | 3 I*\/ 7 | |x + - - + -------|*|x + - - - -------| \ 2 2 / \ 2 2 /
(x - 3/2 + i*sqrt(7)/2)*(x - 3/2 - i*sqrt(7)/2)
2 -4 - x + 3*x
-4 - x^2 + 3*x
-4 + x*(3 - x)
-4.0 - x^2 + 3.0*x