A:
Positive:
1 x 7870283455 x 15740566917 x 4629578585 x 9259157229 x 34368051145 x 6873613893 x 20216519465 x 40433
Negative:
-1 x -787028345-5 x -157405669-17 x -46295785-85 x -9259157-229 x -3436805-1145 x -687361-3893 x -202165-19465 x -40433
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 787,028,345, 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 | 787,028,345 | |
| -1 | -787,028,345 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 787,028,345.
Example:
1 x 787,028,345 = 787,028,345
and
-1 x -787,028,345 = 787,028,345
Notice both answers equal 787,028,345
With that explanation out of the way, let's continue. Next, we take the number 787,028,345 and divide it by 2:
787,028,345 ÷ 2 = 393,514,172.5
If the quotient is a whole number, then 2 and 393,514,172.5 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 | 787,028,345 | |
| -1 | -787,028,345 |
Now, we try dividing 787,028,345 by 3:
787,028,345 ÷ 3 = 262,342,781.6667
If the quotient is a whole number, then 3 and 262,342,781.6667 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 | 787,028,345 | |
| -1 | -787,028,345 |
Let's try dividing by 4:
787,028,345 ÷ 4 = 196,757,086.25
If the quotient is a whole number, then 4 and 196,757,086.25 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 | 787,028,345 | |
| -1 | 787,028,345 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 229 | 1,145 | 3,893 | 19,465 | 40,433 | 202,165 | 687,361 | 3,436,805 | 9,259,157 | 46,295,785 | 157,405,669 | 787,028,345 |
| -1 | -5 | -17 | -85 | -229 | -1,145 | -3,893 | -19,465 | -40,433 | -202,165 | -687,361 | -3,436,805 | -9,259,157 | -46,295,785 | -157,405,669 | -787,028,345 |
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