A:
Positive:
1 x 121282855 x 242565713 x 93294531 x 39123565 x 186589155 x 78247169 x 71765403 x 30095463 x 26195845 x 143532015 x 60192315 x 5239
Negative:
-1 x -12128285-5 x -2425657-13 x -932945-31 x -391235-65 x -186589-155 x -78247-169 x -71765-403 x -30095-463 x -26195-845 x -14353-2015 x -6019-2315 x -5239
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 12,128,285, 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 | 12,128,285 | |
| -1 | -12,128,285 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,128,285.
Example:
1 x 12,128,285 = 12,128,285
and
-1 x -12,128,285 = 12,128,285
Notice both answers equal 12,128,285
With that explanation out of the way, let's continue. Next, we take the number 12,128,285 and divide it by 2:
12,128,285 ÷ 2 = 6,064,142.5
If the quotient is a whole number, then 2 and 6,064,142.5 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 | 12,128,285 | |
| -1 | -12,128,285 |
Now, we try dividing 12,128,285 by 3:
12,128,285 ÷ 3 = 4,042,761.6667
If the quotient is a whole number, then 3 and 4,042,761.6667 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 | 12,128,285 | |
| -1 | -12,128,285 |
Let's try dividing by 4:
12,128,285 ÷ 4 = 3,032,071.25
If the quotient is a whole number, then 4 and 3,032,071.25 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 | 12,128,285 | |
| -1 | 12,128,285 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 31 | 65 | 155 | 169 | 403 | 463 | 845 | 2,015 | 2,315 | 5,239 | 6,019 | 14,353 | 26,195 | 30,095 | 71,765 | 78,247 | 186,589 | 391,235 | 932,945 | 2,425,657 | 12,128,285 |
| -1 | -5 | -13 | -31 | -65 | -155 | -169 | -403 | -463 | -845 | -2,015 | -2,315 | -5,239 | -6,019 | -14,353 | -26,195 | -30,095 | -71,765 | -78,247 | -186,589 | -391,235 | -932,945 | -2,425,657 | -12,128,285 |
Here are some more numbers to try:
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