A:
Positive:
1 x 7851385437 x 112162649151 x 5199593191 x 41106731057 x 7427991337 x 5872393889 x 20188727223 x 28841
Negative:
-1 x -785138543-7 x -112162649-151 x -5199593-191 x -4110673-1057 x -742799-1337 x -587239-3889 x -201887-27223 x -28841
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 785,138,543, 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 | 785,138,543 | |
| -1 | -785,138,543 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 785,138,543.
Example:
1 x 785,138,543 = 785,138,543
and
-1 x -785,138,543 = 785,138,543
Notice both answers equal 785,138,543
With that explanation out of the way, let's continue. Next, we take the number 785,138,543 and divide it by 2:
785,138,543 ÷ 2 = 392,569,271.5
If the quotient is a whole number, then 2 and 392,569,271.5 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 | 785,138,543 | |
| -1 | -785,138,543 |
Now, we try dividing 785,138,543 by 3:
785,138,543 ÷ 3 = 261,712,847.6667
If the quotient is a whole number, then 3 and 261,712,847.6667 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 | 785,138,543 | |
| -1 | -785,138,543 |
Let's try dividing by 4:
785,138,543 ÷ 4 = 196,284,635.75
If the quotient is a whole number, then 4 and 196,284,635.75 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 | 785,138,543 | |
| -1 | 785,138,543 |
If you did it right, you will end up with this table:
| 1 | 7 | 151 | 191 | 1,057 | 1,337 | 3,889 | 27,223 | 28,841 | 201,887 | 587,239 | 742,799 | 4,110,673 | 5,199,593 | 112,162,649 | 785,138,543 |
| -1 | -7 | -151 | -191 | -1,057 | -1,337 | -3,889 | -27,223 | -28,841 | -201,887 | -587,239 | -742,799 | -4,110,673 | -5,199,593 | -112,162,649 | -785,138,543 |
Here are some more numbers to try:
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