A:
Positive:
1 x 2153415117 x 3076307311 x 1957650177 x 2796643223 x 9656571561 x 1379512453 x 8778712541 x 17171
Negative:
-1 x -215341511-7 x -30763073-11 x -19576501-77 x -2796643-223 x -965657-1561 x -137951-2453 x -87787-12541 x -17171
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 215,341,511, 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 | 215,341,511 | |
| -1 | -215,341,511 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,341,511.
Example:
1 x 215,341,511 = 215,341,511
and
-1 x -215,341,511 = 215,341,511
Notice both answers equal 215,341,511
With that explanation out of the way, let's continue. Next, we take the number 215,341,511 and divide it by 2:
215,341,511 ÷ 2 = 107,670,755.5
If the quotient is a whole number, then 2 and 107,670,755.5 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 | 215,341,511 | |
| -1 | -215,341,511 |
Now, we try dividing 215,341,511 by 3:
215,341,511 ÷ 3 = 71,780,503.6667
If the quotient is a whole number, then 3 and 71,780,503.6667 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 | 215,341,511 | |
| -1 | -215,341,511 |
Let's try dividing by 4:
215,341,511 ÷ 4 = 53,835,377.75
If the quotient is a whole number, then 4 and 53,835,377.75 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 | 215,341,511 | |
| -1 | 215,341,511 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 223 | 1,561 | 2,453 | 12,541 | 17,171 | 87,787 | 137,951 | 965,657 | 2,796,643 | 19,576,501 | 30,763,073 | 215,341,511 |
| -1 | -7 | -11 | -77 | -223 | -1,561 | -2,453 | -12,541 | -17,171 | -87,787 | -137,951 | -965,657 | -2,796,643 | -19,576,501 | -30,763,073 | -215,341,511 |
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