21 x 7 49 x 3 147 x 1
3 and 7
The numbers are: 1 plus square root of 21 and 1 minus square root of 21
7x3 or 3x7, which is all you can do to multiply to get 21.
The factor pairs of 189 are: 1 x 189 3 x 63 7 x 27 9 x 21
21 x 7 49 x 3 147 x 1
3 and 7
1 x 42 2 x 21 3 x 14 6 x 7
The numbers are: 1 plus square root of 21 and 1 minus square root of 21
7x3 or 3x7, which is all you can do to multiply to get 21.
42
The numbers are: -1 and -20
The factor pairs of 189 are: 1 x 189 3 x 63 7 x 27 9 x 21
21
The numbers are: 3 -sq rt of 21 and 3 +sq rt of 21
7 and 21
10.5 x 2=21