A:
Positive:
1 x 2872279155 x 5744558313 x 2209445565 x 44188911063 x 2702054157 x 690955315 x 5404113819 x 20785
Negative:
-1 x -287227915-5 x -57445583-13 x -22094455-65 x -4418891-1063 x -270205-4157 x -69095-5315 x -54041-13819 x -20785
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 287,227,915, 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 | 287,227,915 | |
| -1 | -287,227,915 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 287,227,915.
Example:
1 x 287,227,915 = 287,227,915
and
-1 x -287,227,915 = 287,227,915
Notice both answers equal 287,227,915
With that explanation out of the way, let's continue. Next, we take the number 287,227,915 and divide it by 2:
287,227,915 ÷ 2 = 143,613,957.5
If the quotient is a whole number, then 2 and 143,613,957.5 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 | 287,227,915 | |
| -1 | -287,227,915 |
Now, we try dividing 287,227,915 by 3:
287,227,915 ÷ 3 = 95,742,638.3333
If the quotient is a whole number, then 3 and 95,742,638.3333 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 | 287,227,915 | |
| -1 | -287,227,915 |
Let's try dividing by 4:
287,227,915 ÷ 4 = 71,806,978.75
If the quotient is a whole number, then 4 and 71,806,978.75 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 | 287,227,915 | |
| -1 | 287,227,915 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 1,063 | 4,157 | 5,315 | 13,819 | 20,785 | 54,041 | 69,095 | 270,205 | 4,418,891 | 22,094,455 | 57,445,583 | 287,227,915 |
| -1 | -5 | -13 | -65 | -1,063 | -4,157 | -5,315 | -13,819 | -20,785 | -54,041 | -69,095 | -270,205 | -4,418,891 | -22,094,455 | -57,445,583 | -287,227,915 |
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