A:
Positive:
1 x 7870508655 x 15741017329 x 2713968537 x 21271645145 x 5427937185 x 42543291073 x 7335055365 x 146701
Negative:
-1 x -787050865-5 x -157410173-29 x -27139685-37 x -21271645-145 x -5427937-185 x -4254329-1073 x -733505-5365 x -146701
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 787,050,865, 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 | 787,050,865 | |
| -1 | -787,050,865 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 787,050,865.
Example:
1 x 787,050,865 = 787,050,865
and
-1 x -787,050,865 = 787,050,865
Notice both answers equal 787,050,865
With that explanation out of the way, let's continue. Next, we take the number 787,050,865 and divide it by 2:
787,050,865 ÷ 2 = 393,525,432.5
If the quotient is a whole number, then 2 and 393,525,432.5 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 | 787,050,865 | |
| -1 | -787,050,865 |
Now, we try dividing 787,050,865 by 3:
787,050,865 ÷ 3 = 262,350,288.3333
If the quotient is a whole number, then 3 and 262,350,288.3333 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 | 787,050,865 | |
| -1 | -787,050,865 |
Let's try dividing by 4:
787,050,865 ÷ 4 = 196,762,716.25
If the quotient is a whole number, then 4 and 196,762,716.25 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 | 787,050,865 | |
| -1 | 787,050,865 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 37 | 145 | 185 | 1,073 | 5,365 | 146,701 | 733,505 | 4,254,329 | 5,427,937 | 21,271,645 | 27,139,685 | 157,410,173 | 787,050,865 |
| -1 | -5 | -29 | -37 | -145 | -185 | -1,073 | -5,365 | -146,701 | -733,505 | -4,254,329 | -5,427,937 | -21,271,645 | -27,139,685 | -157,410,173 | -787,050,865 |
Here are some more numbers to try:
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