Answer:
3(7a + 3)
Step-by-step explanation:
3 is the greatest common factor between 21 and 9
put 3 outside the parenthesis and divide both numbers by 3
3(7a + 3)
Answer:
3(7a+3)
Step-by-step explanation:
Find the common factor
3 multiplied by 7 equals 21, and 3 times 3 equals 9
Take the common factor out of the parenthesis
3( _a+_)
and put in 7 and 3 in the appropriate spots
3(7a+3)
double check
3 times 7 is 21, 3 times 3 is 9
3(7a+3)= 21a+9
