A:
Positive:
1 x 129967817 x 185668331 x 419251101 x 128681217 x 59893593 x 21917707 x 183833131 x 4151
Negative:
-1 x -12996781-7 x -1856683-31 x -419251-101 x -128681-217 x -59893-593 x -21917-707 x -18383-3131 x -4151
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 12,996,781, 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 | 12,996,781 | |
| -1 | -12,996,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,996,781.
Example:
1 x 12,996,781 = 12,996,781
and
-1 x -12,996,781 = 12,996,781
Notice both answers equal 12,996,781
With that explanation out of the way, let's continue. Next, we take the number 12,996,781 and divide it by 2:
12,996,781 ÷ 2 = 6,498,390.5
If the quotient is a whole number, then 2 and 6,498,390.5 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 | 12,996,781 | |
| -1 | -12,996,781 |
Now, we try dividing 12,996,781 by 3:
12,996,781 ÷ 3 = 4,332,260.3333
If the quotient is a whole number, then 3 and 4,332,260.3333 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 | 12,996,781 | |
| -1 | -12,996,781 |
Let's try dividing by 4:
12,996,781 ÷ 4 = 3,249,195.25
If the quotient is a whole number, then 4 and 3,249,195.25 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 | 12,996,781 | |
| -1 | 12,996,781 |
If you did it right, you will end up with this table:
| 1 | 7 | 31 | 101 | 217 | 593 | 707 | 3,131 | 4,151 | 18,383 | 21,917 | 59,893 | 128,681 | 419,251 | 1,856,683 | 12,996,781 |
| -1 | -7 | -31 | -101 | -217 | -593 | -707 | -3,131 | -4,151 | -18,383 | -21,917 | -59,893 | -128,681 | -419,251 | -1,856,683 | -12,996,781 |
Here are some more numbers to try:
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