A:
Positive:
1 x 307217655 x 614435319 x 161693595 x 323387331 x 92815977 x 314451655 x 185634885 x 6289
Negative:
-1 x -30721765-5 x -6144353-19 x -1616935-95 x -323387-331 x -92815-977 x -31445-1655 x -18563-4885 x -6289
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 30,721,765, 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 | 30,721,765 | |
| -1 | -30,721,765 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 30,721,765.
Example:
1 x 30,721,765 = 30,721,765
and
-1 x -30,721,765 = 30,721,765
Notice both answers equal 30,721,765
With that explanation out of the way, let's continue. Next, we take the number 30,721,765 and divide it by 2:
30,721,765 ÷ 2 = 15,360,882.5
If the quotient is a whole number, then 2 and 15,360,882.5 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 | 30,721,765 | |
| -1 | -30,721,765 |
Now, we try dividing 30,721,765 by 3:
30,721,765 ÷ 3 = 10,240,588.3333
If the quotient is a whole number, then 3 and 10,240,588.3333 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 | 30,721,765 | |
| -1 | -30,721,765 |
Let's try dividing by 4:
30,721,765 ÷ 4 = 7,680,441.25
If the quotient is a whole number, then 4 and 7,680,441.25 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 | 30,721,765 | |
| -1 | 30,721,765 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 331 | 977 | 1,655 | 4,885 | 6,289 | 18,563 | 31,445 | 92,815 | 323,387 | 1,616,935 | 6,144,353 | 30,721,765 |
| -1 | -5 | -19 | -95 | -331 | -977 | -1,655 | -4,885 | -6,289 | -18,563 | -31,445 | -92,815 | -323,387 | -1,616,935 | -6,144,353 | -30,721,765 |
Here are some more numbers to try:
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