A:
Positive:
1 x 8721207119 x 459010937 x 2357083131 x 665741703 x 124057947 x 920932489 x 350394847 x 17993
Negative:
-1 x -87212071-19 x -4590109-37 x -2357083-131 x -665741-703 x -124057-947 x -92093-2489 x -35039-4847 x -17993
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 87,212,071, 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 | 87,212,071 | |
| -1 | -87,212,071 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,212,071.
Example:
1 x 87,212,071 = 87,212,071
and
-1 x -87,212,071 = 87,212,071
Notice both answers equal 87,212,071
With that explanation out of the way, let's continue. Next, we take the number 87,212,071 and divide it by 2:
87,212,071 ÷ 2 = 43,606,035.5
If the quotient is a whole number, then 2 and 43,606,035.5 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 | 87,212,071 | |
| -1 | -87,212,071 |
Now, we try dividing 87,212,071 by 3:
87,212,071 ÷ 3 = 29,070,690.3333
If the quotient is a whole number, then 3 and 29,070,690.3333 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 | 87,212,071 | |
| -1 | -87,212,071 |
Let's try dividing by 4:
87,212,071 ÷ 4 = 21,803,017.75
If the quotient is a whole number, then 4 and 21,803,017.75 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 | 87,212,071 | |
| -1 | 87,212,071 |
If you did it right, you will end up with this table:
| 1 | 19 | 37 | 131 | 703 | 947 | 2,489 | 4,847 | 17,993 | 35,039 | 92,093 | 124,057 | 665,741 | 2,357,083 | 4,590,109 | 87,212,071 |
| -1 | -19 | -37 | -131 | -703 | -947 | -2,489 | -4,847 | -17,993 | -35,039 | -92,093 | -124,057 | -665,741 | -2,357,083 | -4,590,109 | -87,212,071 |
Here are some more numbers to try:
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