A:
Positive:
1 x 28573097 x 40818713 x 21979317 x 16807791 x 31399119 x 24011221 x 129291547 x 1847
Negative:
-1 x -2857309-7 x -408187-13 x -219793-17 x -168077-91 x -31399-119 x -24011-221 x -12929-1547 x -1847
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 2,857,309, 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 | 2,857,309 | |
| -1 | -2,857,309 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,857,309.
Example:
1 x 2,857,309 = 2,857,309
and
-1 x -2,857,309 = 2,857,309
Notice both answers equal 2,857,309
With that explanation out of the way, let's continue. Next, we take the number 2,857,309 and divide it by 2:
2,857,309 ÷ 2 = 1,428,654.5
If the quotient is a whole number, then 2 and 1,428,654.5 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 | 2,857,309 | |
| -1 | -2,857,309 |
Now, we try dividing 2,857,309 by 3:
2,857,309 ÷ 3 = 952,436.3333
If the quotient is a whole number, then 3 and 952,436.3333 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 | 2,857,309 | |
| -1 | -2,857,309 |
Let's try dividing by 4:
2,857,309 ÷ 4 = 714,327.25
If the quotient is a whole number, then 4 and 714,327.25 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 | 2,857,309 | |
| -1 | 2,857,309 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 17 | 91 | 119 | 221 | 1,547 | 1,847 | 12,929 | 24,011 | 31,399 | 168,077 | 219,793 | 408,187 | 2,857,309 |
| -1 | -7 | -13 | -17 | -91 | -119 | -221 | -1,547 | -1,847 | -12,929 | -24,011 | -31,399 | -168,077 | -219,793 | -408,187 | -2,857,309 |
Here are some more numbers to try:
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