Answer
$y^3+11y^2+15y-27$.
Work Step by Step
The given expression is
$=(y+9)(y^2+2y-3)$
Distribute $(y^2+2y-3)$ to each term of $(y+9)$.
$=y(y^2+2y-3)+9(y^2+2y-3)$
Use distributive property.
$=y(y^2)+y(2y)+y(-3)+9(y^2)+9(2y)+9(-3)$
Multiply.
$=y^3+2y^2-3y+9y^2+18y-27$
Combine like terms.
$=y^3+11y^2+15y-27$
Hence, the product is $y^3+11y^2+15y-27$.
