Hello!
First you have to find the greatest common factor of 6 and 8
The greatest common factor is 2
You divide the who expression by 2
[tex] \frac{6a+8b}{2} =3a + 4b[/tex]
Put your answer is parenthesis and what you divide by outside of the parenthesis
2(3a + 4b)
The answer is 2(3a + 4b)
Hope this helps!