Помогите срочно!!!!!(2y-1)(4y^2+2y+1)-y(y+1)(y-1)

Question

Помогите срочно!!!!!
(2y-1)(4y^2+2y+1)-y(y+1)(y-1)

Answer 1

1)(y-1)*(y+1)=y^2-1.
(2y-1)(4y^2+2y+1)=8y^3+4y^2+2y-4y^2-2y-1.  =>(2y-1)*(4y^2+2y+1)-Y(y^2-1)=8y^3+4y^2+2y-4y^2-2y-1-y^3+1=7y^3