Answer:
y^3 + 27
Step-by-step explanation:
(y+3)(y2 – 3y+9)
distribute y
y^3 - 3y^2 + 9y
distribute 3
3y^2 - 9y + 27
add/combine like terms and order correctly
y^3 + (3y^2 - 3y^2) + (9y - 9y) + 27
answer
