Упростите выражение (3-y)(y+3y+y^2)-(3-y)(3+y)+y^3

Question

Упростите выражение (3-y)(y+3y+y^2)-(3-y)(3+y)+y^3

Answer 1

(3-y)(y+3y+y²)-(3-y)(3+y)+y³
3y+9y+3y²-y²-3y²-y³-9-y²+y³
12y-2y²-9
-2y²+12y-9