They are 1 and 3
1, 2, 3, 6
r^2 - 12r + 27 what two factors of 27 add up to - 12? (r - 3)(r - 9) FOIL that and get the quadratic polynomial back
1, 3, 9, 27 1, 3, 19, 57
1 and 5
How about: 8 16 and 24
1,11,12,13,14,15,16,17,18,19,2,6,7,8,9,3,4,5, those r some of the factors between 10 and 20
-9
Greatest common factor of 12 and 18 and 24 is 6.
17 and 34's highest common factor is 17.
The factors for 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.
presumably, r=27?
24