A:
Positive:
1 x 71210155 x 142420311 x 64736543 x 16560555 x 129473215 x 33121473 x 150552365 x 3011
Negative:
-1 x -7121015-5 x -1424203-11 x -647365-43 x -165605-55 x -129473-215 x -33121-473 x -15055-2365 x -3011
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 7,121,015, 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 | 7,121,015 | |
| -1 | -7,121,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,121,015.
Example:
1 x 7,121,015 = 7,121,015
and
-1 x -7,121,015 = 7,121,015
Notice both answers equal 7,121,015
With that explanation out of the way, let's continue. Next, we take the number 7,121,015 and divide it by 2:
7,121,015 ÷ 2 = 3,560,507.5
If the quotient is a whole number, then 2 and 3,560,507.5 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 | 7,121,015 | |
| -1 | -7,121,015 |
Now, we try dividing 7,121,015 by 3:
7,121,015 ÷ 3 = 2,373,671.6667
If the quotient is a whole number, then 3 and 2,373,671.6667 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 | 7,121,015 | |
| -1 | -7,121,015 |
Let's try dividing by 4:
7,121,015 ÷ 4 = 1,780,253.75
If the quotient is a whole number, then 4 and 1,780,253.75 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 | 7,121,015 | |
| -1 | 7,121,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 43 | 55 | 215 | 473 | 2,365 | 3,011 | 15,055 | 33,121 | 129,473 | 165,605 | 647,365 | 1,424,203 | 7,121,015 |
| -1 | -5 | -11 | -43 | -55 | -215 | -473 | -2,365 | -3,011 | -15,055 | -33,121 | -129,473 | -165,605 | -647,365 | -1,424,203 | -7,121,015 |
Here are some more numbers to try:
Try the factor calculator