A:
Positive:
1 x 2398219817 x 3426028389 x 2694629349 x 687169623 x 3849471103 x 2174272443 x 981677721 x 31061
Negative:
-1 x -239821981-7 x -34260283-89 x -2694629-349 x -687169-623 x -384947-1103 x -217427-2443 x -98167-7721 x -31061
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 239,821,981, 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 | 239,821,981 | |
| -1 | -239,821,981 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 239,821,981.
Example:
1 x 239,821,981 = 239,821,981
and
-1 x -239,821,981 = 239,821,981
Notice both answers equal 239,821,981
With that explanation out of the way, let's continue. Next, we take the number 239,821,981 and divide it by 2:
239,821,981 ÷ 2 = 119,910,990.5
If the quotient is a whole number, then 2 and 119,910,990.5 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 | 239,821,981 | |
| -1 | -239,821,981 |
Now, we try dividing 239,821,981 by 3:
239,821,981 ÷ 3 = 79,940,660.3333
If the quotient is a whole number, then 3 and 79,940,660.3333 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 | 239,821,981 | |
| -1 | -239,821,981 |
Let's try dividing by 4:
239,821,981 ÷ 4 = 59,955,495.25
If the quotient is a whole number, then 4 and 59,955,495.25 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 | 239,821,981 | |
| -1 | 239,821,981 |
If you did it right, you will end up with this table:
| 1 | 7 | 89 | 349 | 623 | 1,103 | 2,443 | 7,721 | 31,061 | 98,167 | 217,427 | 384,947 | 687,169 | 2,694,629 | 34,260,283 | 239,821,981 |
| -1 | -7 | -89 | -349 | -623 | -1,103 | -2,443 | -7,721 | -31,061 | -98,167 | -217,427 | -384,947 | -687,169 | -2,694,629 | -34,260,283 | -239,821,981 |
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