can't wait till I come to that city to be the one to be all around the world and there isn't a thing out there I haven't done for you so keep at it and don't let it get you down when I'm at that party drinking all the liquor with your girls
Distribute 3a over both terms within the parenthesis.
Multiply 3a by a to get 3a2
Multiply 3a by +4 to get 12a
Add all terms by adding 3a2 to 12a to get an answer of "3a2 +12a"