Multiply.

(3y²+y+6)(5y²-2y-5)
Simplify your answer.

15y^4 - 6y^3 - 15y^3 + 6y^2 + 30y^2 - 12y - 5y^2 + 2y + 30

which simplifies to:

15y^4 - 21y^3 + 31y^2 - 10y + 30