A:
Positive:
1 x 72123055 x 144246119 x 37959531 x 23265579 x 9129595 x 75919155 x 46531395 x 18259589 x 12245961 x 75051501 x 48052449 x 2945
Negative:
-1 x -7212305-5 x -1442461-19 x -379595-31 x -232655-79 x -91295-95 x -75919-155 x -46531-395 x -18259-589 x -12245-961 x -7505-1501 x -4805-2449 x -2945
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 7,212,305, 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 | 7,212,305 | |
| -1 | -7,212,305 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,212,305.
Example:
1 x 7,212,305 = 7,212,305
and
-1 x -7,212,305 = 7,212,305
Notice both answers equal 7,212,305
With that explanation out of the way, let's continue. Next, we take the number 7,212,305 and divide it by 2:
7,212,305 ÷ 2 = 3,606,152.5
If the quotient is a whole number, then 2 and 3,606,152.5 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 | 7,212,305 | |
| -1 | -7,212,305 |
Now, we try dividing 7,212,305 by 3:
7,212,305 ÷ 3 = 2,404,101.6667
If the quotient is a whole number, then 3 and 2,404,101.6667 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 | 7,212,305 | |
| -1 | -7,212,305 |
Let's try dividing by 4:
7,212,305 ÷ 4 = 1,803,076.25
If the quotient is a whole number, then 4 and 1,803,076.25 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 | 7,212,305 | |
| -1 | 7,212,305 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 31 | 79 | 95 | 155 | 395 | 589 | 961 | 1,501 | 2,449 | 2,945 | 4,805 | 7,505 | 12,245 | 18,259 | 46,531 | 75,919 | 91,295 | 232,655 | 379,595 | 1,442,461 | 7,212,305 |
| -1 | -5 | -19 | -31 | -79 | -95 | -155 | -395 | -589 | -961 | -1,501 | -2,449 | -2,945 | -4,805 | -7,505 | -12,245 | -18,259 | -46,531 | -75,919 | -91,295 | -232,655 | -379,595 | -1,442,461 | -7,212,305 |
Here are some more numbers to try:
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