Question

I dont know how to get the correct answer​

Answer 1

`42a^(2)`

Explanation:

Split them into sections!

First,
`3a` x
`5a` =
`15a^(2)`

Next,
`(3a+3a+3a)(3a)` =
`9a` x
`3a` =
`27a^(2)`

Add
`15a^(2)` and
`27a^(2)` to get
`42a^(2)`

Hope I helped!