A:
Positive:
1 x 1551212397 x 2216017713 x 1193240391 x 1704629421 x 3684592947 x 526374049 x 383115473 x 28343
Negative:
-1 x -155121239-7 x -22160177-13 x -11932403-91 x -1704629-421 x -368459-2947 x -52637-4049 x -38311-5473 x -28343
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 155,121,239, 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 | 155,121,239 | |
| -1 | -155,121,239 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 155,121,239.
Example:
1 x 155,121,239 = 155,121,239
and
-1 x -155,121,239 = 155,121,239
Notice both answers equal 155,121,239
With that explanation out of the way, let's continue. Next, we take the number 155,121,239 and divide it by 2:
155,121,239 ÷ 2 = 77,560,619.5
If the quotient is a whole number, then 2 and 77,560,619.5 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 | 155,121,239 | |
| -1 | -155,121,239 |
Now, we try dividing 155,121,239 by 3:
155,121,239 ÷ 3 = 51,707,079.6667
If the quotient is a whole number, then 3 and 51,707,079.6667 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 | 155,121,239 | |
| -1 | -155,121,239 |
Let's try dividing by 4:
155,121,239 ÷ 4 = 38,780,309.75
If the quotient is a whole number, then 4 and 38,780,309.75 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 | 155,121,239 | |
| -1 | 155,121,239 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 421 | 2,947 | 4,049 | 5,473 | 28,343 | 38,311 | 52,637 | 368,459 | 1,704,629 | 11,932,403 | 22,160,177 | 155,121,239 |
| -1 | -7 | -13 | -91 | -421 | -2,947 | -4,049 | -5,473 | -28,343 | -38,311 | -52,637 | -368,459 | -1,704,629 | -11,932,403 | -22,160,177 | -155,121,239 |
Here are some more numbers to try:
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