A:
Positive:
1 x 7280075155 x 14560150319 x 3831618579 x 921528595 x 7663237395 x 18430571501 x 4850157505 x 97003
Negative:
-1 x -728007515-5 x -145601503-19 x -38316185-79 x -9215285-95 x -7663237-395 x -1843057-1501 x -485015-7505 x -97003
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 728,007,515, 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 | 728,007,515 | |
| -1 | -728,007,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 728,007,515.
Example:
1 x 728,007,515 = 728,007,515
and
-1 x -728,007,515 = 728,007,515
Notice both answers equal 728,007,515
With that explanation out of the way, let's continue. Next, we take the number 728,007,515 and divide it by 2:
728,007,515 ÷ 2 = 364,003,757.5
If the quotient is a whole number, then 2 and 364,003,757.5 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 | 728,007,515 | |
| -1 | -728,007,515 |
Now, we try dividing 728,007,515 by 3:
728,007,515 ÷ 3 = 242,669,171.6667
If the quotient is a whole number, then 3 and 242,669,171.6667 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 | 728,007,515 | |
| -1 | -728,007,515 |
Let's try dividing by 4:
728,007,515 ÷ 4 = 182,001,878.75
If the quotient is a whole number, then 4 and 182,001,878.75 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 | 728,007,515 | |
| -1 | 728,007,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 79 | 95 | 395 | 1,501 | 7,505 | 97,003 | 485,015 | 1,843,057 | 7,663,237 | 9,215,285 | 38,316,185 | 145,601,503 | 728,007,515 |
| -1 | -5 | -19 | -79 | -95 | -395 | -1,501 | -7,505 | -97,003 | -485,015 | -1,843,057 | -7,663,237 | -9,215,285 | -38,316,185 | -145,601,503 | -728,007,515 |
Here are some more numbers to try:
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