-2 and -7
-3 and -6
-12 and 3
-18 and 9
-21 and 12
273
-8
Add them up. The factors of 9 are 1, 3 and 9. The sum of the factors is 13.
How about 3 and 6
6 and 9
3 and 12 9 and 18 12 and 21
268
Factors of 252 = 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
The factors of 252 are: 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252.
The factors of 9 are 1, 3, and 9. 1 + 3 + 9 = 13
7 and 2
9 and -3