The expression 9+21 factored using the GCF is

Question

i can't find out what it is 

Answer 1

What is the GCF of 9 and 21?

 

Factors of 9 = 1,3,9

Factors of 21 = 1,3,7,21

 

What's the largest common factor? 3.

 

9/3 = 3

21/3 = 7

 

9 + 21 = 3(3 + 7)