3 2 y - 18*y + 81*y
y^3 - 18*y^2 + 81*y
/ 2 \ y*\81 + y - 18*y/
y*(81 + y^2 - 18*y)
1*(x + 0)*(x - 9)
(1*(x + 0))*(x - 9)
y^3 + 81.0*y - 18.0*y^2
2 y*(-9 + y)
y*(-9 + y)^2