A:
Positive:
1 x 1291148155 x 2582296329 x 4452235145 x 890447151 x 855065755 x 1710134379 x 294855897 x 21895
Negative:
-1 x -129114815-5 x -25822963-29 x -4452235-145 x -890447-151 x -855065-755 x -171013-4379 x -29485-5897 x -21895
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 129,114,815, 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 | 129,114,815 | |
| -1 | -129,114,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 129,114,815.
Example:
1 x 129,114,815 = 129,114,815
and
-1 x -129,114,815 = 129,114,815
Notice both answers equal 129,114,815
With that explanation out of the way, let's continue. Next, we take the number 129,114,815 and divide it by 2:
129,114,815 ÷ 2 = 64,557,407.5
If the quotient is a whole number, then 2 and 64,557,407.5 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 | 129,114,815 | |
| -1 | -129,114,815 |
Now, we try dividing 129,114,815 by 3:
129,114,815 ÷ 3 = 43,038,271.6667
If the quotient is a whole number, then 3 and 43,038,271.6667 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 | 129,114,815 | |
| -1 | -129,114,815 |
Let's try dividing by 4:
129,114,815 ÷ 4 = 32,278,703.75
If the quotient is a whole number, then 4 and 32,278,703.75 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 | 129,114,815 | |
| -1 | 129,114,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 145 | 151 | 755 | 4,379 | 5,897 | 21,895 | 29,485 | 171,013 | 855,065 | 890,447 | 4,452,235 | 25,822,963 | 129,114,815 |
| -1 | -5 | -29 | -145 | -151 | -755 | -4,379 | -5,897 | -21,895 | -29,485 | -171,013 | -855,065 | -890,447 | -4,452,235 | -25,822,963 | -129,114,815 |
Here are some more numbers to try:
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