Answer:
The answer is 6(3a + 2)
Explanation:
The GCF of 18 and 12 is 6 so then what time 6 gives you 18a and 12? 6x3a=18a and 6x2=12 and then just put your GCF (6) outside the parenthesis and then you factors inside the parenthesis. Don't forget to put the variable and the signs.