A:
Positive:
1 x 7211464155 x 14422928311 x 6555876555 x 131117531499 x 4810857495 x 962178747 x 8244516489 x 43735
Negative:
-1 x -721146415-5 x -144229283-11 x -65558765-55 x -13111753-1499 x -481085-7495 x -96217-8747 x -82445-16489 x -43735
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 721,146,415, 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 | 721,146,415 | |
| -1 | -721,146,415 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 721,146,415.
Example:
1 x 721,146,415 = 721,146,415
and
-1 x -721,146,415 = 721,146,415
Notice both answers equal 721,146,415
With that explanation out of the way, let's continue. Next, we take the number 721,146,415 and divide it by 2:
721,146,415 ÷ 2 = 360,573,207.5
If the quotient is a whole number, then 2 and 360,573,207.5 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 | 721,146,415 | |
| -1 | -721,146,415 |
Now, we try dividing 721,146,415 by 3:
721,146,415 ÷ 3 = 240,382,138.3333
If the quotient is a whole number, then 3 and 240,382,138.3333 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 | 721,146,415 | |
| -1 | -721,146,415 |
Let's try dividing by 4:
721,146,415 ÷ 4 = 180,286,603.75
If the quotient is a whole number, then 4 and 180,286,603.75 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 | 721,146,415 | |
| -1 | 721,146,415 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 1,499 | 7,495 | 8,747 | 16,489 | 43,735 | 82,445 | 96,217 | 481,085 | 13,111,753 | 65,558,765 | 144,229,283 | 721,146,415 |
| -1 | -5 | -11 | -55 | -1,499 | -7,495 | -8,747 | -16,489 | -43,735 | -82,445 | -96,217 | -481,085 | -13,111,753 | -65,558,765 | -144,229,283 | -721,146,415 |
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