A:
Positive:
1 x 12992164361 x 212986367 x 193912983 x 1565321383 x 3392214087 x 317895063 x 256615561 x 23363
Negative:
-1 x -129921643-61 x -2129863-67 x -1939129-83 x -1565321-383 x -339221-4087 x -31789-5063 x -25661-5561 x -23363
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 129,921,643, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 129,921,643 | |
| -1 | -129,921,643 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 129,921,643.
Example:
1 x 129,921,643 = 129,921,643
and
-1 x -129,921,643 = 129,921,643
Notice both answers equal 129,921,643
With that explanation out of the way, let's continue. Next, we take the number 129,921,643 and divide it by 2:
129,921,643 ÷ 2 = 64,960,821.5
If the quotient is a whole number, then 2 and 64,960,821.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 129,921,643 | |
| -1 | -129,921,643 |
Now, we try dividing 129,921,643 by 3:
129,921,643 ÷ 3 = 43,307,214.3333
If the quotient is a whole number, then 3 and 43,307,214.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 129,921,643 | |
| -1 | -129,921,643 |
Let's try dividing by 4:
129,921,643 ÷ 4 = 32,480,410.75
If the quotient is a whole number, then 4 and 32,480,410.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 129,921,643 | |
| -1 | 129,921,643 |
If you did it right, you will end up with this table:
| 1 | 61 | 67 | 83 | 383 | 4,087 | 5,063 | 5,561 | 23,363 | 25,661 | 31,789 | 339,221 | 1,565,321 | 1,939,129 | 2,129,863 | 129,921,643 |
| -1 | -61 | -67 | -83 | -383 | -4,087 | -5,063 | -5,561 | -23,363 | -25,661 | -31,789 | -339,221 | -1,565,321 | -1,939,129 | -2,129,863 | -129,921,643 |
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