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