A:
Positive:
1 x 39850855 x 79701713 x 30654537 x 10770565 x 61309185 x 21541481 x 82851657 x 2405
Negative:
-1 x -3985085-5 x -797017-13 x -306545-37 x -107705-65 x -61309-185 x -21541-481 x -8285-1657 x -2405
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 3,985,085, 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 | 3,985,085 | |
| -1 | -3,985,085 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 3,985,085.
Example:
1 x 3,985,085 = 3,985,085
and
-1 x -3,985,085 = 3,985,085
Notice both answers equal 3,985,085
With that explanation out of the way, let's continue. Next, we take the number 3,985,085 and divide it by 2:
3,985,085 ÷ 2 = 1,992,542.5
If the quotient is a whole number, then 2 and 1,992,542.5 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 | 3,985,085 | |
| -1 | -3,985,085 |
Now, we try dividing 3,985,085 by 3:
3,985,085 ÷ 3 = 1,328,361.6667
If the quotient is a whole number, then 3 and 1,328,361.6667 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 | 3,985,085 | |
| -1 | -3,985,085 |
Let's try dividing by 4:
3,985,085 ÷ 4 = 996,271.25
If the quotient is a whole number, then 4 and 996,271.25 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 | 3,985,085 | |
| -1 | 3,985,085 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 37 | 65 | 185 | 481 | 1,657 | 2,405 | 8,285 | 21,541 | 61,309 | 107,705 | 306,545 | 797,017 | 3,985,085 |
| -1 | -5 | -13 | -37 | -65 | -185 | -481 | -1,657 | -2,405 | -8,285 | -21,541 | -61,309 | -107,705 | -306,545 | -797,017 | -3,985,085 |
Here are some more numbers to try:
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