A:
Positive:
1 x 78150055 x 156300111 x 71045555 x 142091151 x 51755755 x 10351941 x 83051661 x 4705
Negative:
-1 x -7815005-5 x -1563001-11 x -710455-55 x -142091-151 x -51755-755 x -10351-941 x -8305-1661 x -4705
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 7,815,005, 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 | 7,815,005 | |
| -1 | -7,815,005 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,815,005.
Example:
1 x 7,815,005 = 7,815,005
and
-1 x -7,815,005 = 7,815,005
Notice both answers equal 7,815,005
With that explanation out of the way, let's continue. Next, we take the number 7,815,005 and divide it by 2:
7,815,005 ÷ 2 = 3,907,502.5
If the quotient is a whole number, then 2 and 3,907,502.5 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 | 7,815,005 | |
| -1 | -7,815,005 |
Now, we try dividing 7,815,005 by 3:
7,815,005 ÷ 3 = 2,605,001.6667
If the quotient is a whole number, then 3 and 2,605,001.6667 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 | 7,815,005 | |
| -1 | -7,815,005 |
Let's try dividing by 4:
7,815,005 ÷ 4 = 1,953,751.25
If the quotient is a whole number, then 4 and 1,953,751.25 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 | 7,815,005 | |
| -1 | 7,815,005 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 151 | 755 | 941 | 1,661 | 4,705 | 8,305 | 10,351 | 51,755 | 142,091 | 710,455 | 1,563,001 | 7,815,005 |
| -1 | -5 | -11 | -55 | -151 | -755 | -941 | -1,661 | -4,705 | -8,305 | -10,351 | -51,755 | -142,091 | -710,455 | -1,563,001 | -7,815,005 |
Here are some more numbers to try:
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