Respuesta :

theawsomepro

Answer: 21a+17b


Step-by-step explanation: To get rid of the parenthese you must multiply or distribute 9 to all the numbers inside the parentheses.

9(a +b) + 4(3a + 2b)

9a+9b+12a+8b

Combine like terms

9a+9b+12a+8b

21a+17b

And we have our answer.

21a+17b Hope this helps!