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