A:
Positive:
1 x 7214040355 x 14428080711 x 6558218555 x 1311643797 x 7437155485 x 14874311067 x 6761055335 x 135221
Negative:
-1 x -721404035-5 x -144280807-11 x -65582185-55 x -13116437-97 x -7437155-485 x -1487431-1067 x -676105-5335 x -135221
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 721,404,035, 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 | 721,404,035 | |
| -1 | -721,404,035 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 721,404,035.
Example:
1 x 721,404,035 = 721,404,035
and
-1 x -721,404,035 = 721,404,035
Notice both answers equal 721,404,035
With that explanation out of the way, let's continue. Next, we take the number 721,404,035 and divide it by 2:
721,404,035 ÷ 2 = 360,702,017.5
If the quotient is a whole number, then 2 and 360,702,017.5 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 | 721,404,035 | |
| -1 | -721,404,035 |
Now, we try dividing 721,404,035 by 3:
721,404,035 ÷ 3 = 240,468,011.6667
If the quotient is a whole number, then 3 and 240,468,011.6667 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 | 721,404,035 | |
| -1 | -721,404,035 |
Let's try dividing by 4:
721,404,035 ÷ 4 = 180,351,008.75
If the quotient is a whole number, then 4 and 180,351,008.75 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 | 721,404,035 | |
| -1 | 721,404,035 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 97 | 485 | 1,067 | 5,335 | 135,221 | 676,105 | 1,487,431 | 7,437,155 | 13,116,437 | 65,582,185 | 144,280,807 | 721,404,035 |
| -1 | -5 | -11 | -55 | -97 | -485 | -1,067 | -5,335 | -135,221 | -676,105 | -1,487,431 | -7,437,155 | -13,116,437 | -65,582,185 | -144,280,807 | -721,404,035 |
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