A:
Positive:
1 x 1280598117 x 75329319 x 67399941 x 312341323 x 39647697 x 18373779 x 16439967 x 13243
Negative:
-1 x -12805981-17 x -753293-19 x -673999-41 x -312341-323 x -39647-697 x -18373-779 x -16439-967 x -13243
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 12,805,981, 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 | 12,805,981 | |
| -1 | -12,805,981 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,805,981.
Example:
1 x 12,805,981 = 12,805,981
and
-1 x -12,805,981 = 12,805,981
Notice both answers equal 12,805,981
With that explanation out of the way, let's continue. Next, we take the number 12,805,981 and divide it by 2:
12,805,981 ÷ 2 = 6,402,990.5
If the quotient is a whole number, then 2 and 6,402,990.5 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 | 12,805,981 | |
| -1 | -12,805,981 |
Now, we try dividing 12,805,981 by 3:
12,805,981 ÷ 3 = 4,268,660.3333
If the quotient is a whole number, then 3 and 4,268,660.3333 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 | 12,805,981 | |
| -1 | -12,805,981 |
Let's try dividing by 4:
12,805,981 ÷ 4 = 3,201,495.25
If the quotient is a whole number, then 4 and 3,201,495.25 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 | 12,805,981 | |
| -1 | 12,805,981 |
If you did it right, you will end up with this table:
| 1 | 17 | 19 | 41 | 323 | 697 | 779 | 967 | 13,243 | 16,439 | 18,373 | 39,647 | 312,341 | 673,999 | 753,293 | 12,805,981 |
| -1 | -17 | -19 | -41 | -323 | -697 | -779 | -967 | -13,243 | -16,439 | -18,373 | -39,647 | -312,341 | -673,999 | -753,293 | -12,805,981 |
Here are some more numbers to try:
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