Answer:
you can do many ways one would be 3(5x times 3) (hope this helps and please give me brainliest)
Step-by-step explanation:
9 and 15 have a common factor of 3
divide 15x by 3 which is 5x
then do 9 divided by 3 which is 3
then put 3 outside parentheses and put 5x to show 15x and 3 to show the 9
