4 2 - y + 8*y + 9
-y^4 + 8*y^2 + 9
(x + 3)*(x - 3)*(x + I)*(x - I)
(((x + 3)*(x - 3))*(x + i))*(x - i)
4 2 9 - y + 8*y
9 - y^4 + 8*y^2
/ 2\ -\1 + y /*(-3 + y)*(3 + y)
-(1 + y^2)*(-3 + y)*(3 + y)
2 / 2\ 9 + y *\8 - y /
9 + y^2*(8 - y^2)
9.0 - y^4 + 8.0*y^2