Докажите тождество ( 2y -1)(4y^2+2y+1)-y(y-1)(y+1)

Question

Докажите тождество ( 2y -1)(4y^2+2y+1)-y(y-1)(y+1)

Answer 1

8y^3-1-y*(y^2-1)
8y^3-1-y^3+y
7y^3-1+y