Question

Write an expression that is equivalent to 3(2n+3)+9

Answer 1

use distributive property which is
a(b+c)=ab+ac so
3(2n+3)=6n+9

now we have
6n+9+9
add like terms
6n+18
we can leave it like this or undistribute 6
6(n+3)

so answer is
6n+18 or 6(n+3)