A:
Positive:
1 x 1387131555 x 277426317 x 1981616535 x 3963233367 x 3779651835 x 755932569 x 5399510799 x 12845
Negative:
-1 x -138713155-5 x -27742631-7 x -19816165-35 x -3963233-367 x -377965-1835 x -75593-2569 x -53995-10799 x -12845
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 138,713,155, 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 | 138,713,155 | |
| -1 | -138,713,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 138,713,155.
Example:
1 x 138,713,155 = 138,713,155
and
-1 x -138,713,155 = 138,713,155
Notice both answers equal 138,713,155
With that explanation out of the way, let's continue. Next, we take the number 138,713,155 and divide it by 2:
138,713,155 ÷ 2 = 69,356,577.5
If the quotient is a whole number, then 2 and 69,356,577.5 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 | 138,713,155 | |
| -1 | -138,713,155 |
Now, we try dividing 138,713,155 by 3:
138,713,155 ÷ 3 = 46,237,718.3333
If the quotient is a whole number, then 3 and 46,237,718.3333 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 | 138,713,155 | |
| -1 | -138,713,155 |
Let's try dividing by 4:
138,713,155 ÷ 4 = 34,678,288.75
If the quotient is a whole number, then 4 and 34,678,288.75 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 | 138,713,155 | |
| -1 | 138,713,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 367 | 1,835 | 2,569 | 10,799 | 12,845 | 53,995 | 75,593 | 377,965 | 3,963,233 | 19,816,165 | 27,742,631 | 138,713,155 |
| -1 | -5 | -7 | -35 | -367 | -1,835 | -2,569 | -10,799 | -12,845 | -53,995 | -75,593 | -377,965 | -3,963,233 | -19,816,165 | -27,742,631 | -138,713,155 |
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