Problem
Use the distributive property to remove the parentheses. \[ 9 y^{2}\left(2 y+3 y^{6}\right) \] Simplify. your answer as much as possible.
Solution
Step 1 ：9y^2(2y) + 9y^2(3y^6)
Step 2 ：18y^3 + 27y^8
Step 1 ：9y^2(2y) + 9y^2(3y^6)
Step 2 ：18y^3 + 27y^8
