2 y + 6*y + 9
y^2 + 6*y + 9 при y = 1/3
y^2 + 6*y + 9
(1/3)^2 + 6*(1/3) + 9
(1/3)^2 + 6/3 + 9
100/9
9.0 + y^2 + 6.0*y
9 + y*(6 + y)
2 (3 + y)