21,17,3
(21,1)(7,3)
(21,-1)(7,-3)(-21,1)(-7,3)
30 has four factor pairs:30,115,210,36,5
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12
There are two factor pairs of 21: 21 = 1 x 21 21 = 3 x 7
Factors of 21 are 1, 3, 7, and 21; the factor pairs are (1 x 21) and (3 x 7).
1 & 21, and 3 & 7
1 and 21, 3 and 7,
(1, 21) (3, 7)
1,21 3,7
21,17,3
(21,1)(7,3)
Sixteen factor pairs.
(21,-1)(7,-3)(-21,1)(-7,3)
30 has four factor pairs:30,115,210,36,5
20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)