A:
Positive:
1 x 77810155 x 155620311 x 70736523 x 33830555 x 141473115 x 67661253 x 307551265 x 6151
Negative:
-1 x -7781015-5 x -1556203-11 x -707365-23 x -338305-55 x -141473-115 x -67661-253 x -30755-1265 x -6151
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 7,781,015, 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 | 7,781,015 | |
| -1 | -7,781,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,781,015.
Example:
1 x 7,781,015 = 7,781,015
and
-1 x -7,781,015 = 7,781,015
Notice both answers equal 7,781,015
With that explanation out of the way, let's continue. Next, we take the number 7,781,015 and divide it by 2:
7,781,015 ÷ 2 = 3,890,507.5
If the quotient is a whole number, then 2 and 3,890,507.5 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 | 7,781,015 | |
| -1 | -7,781,015 |
Now, we try dividing 7,781,015 by 3:
7,781,015 ÷ 3 = 2,593,671.6667
If the quotient is a whole number, then 3 and 2,593,671.6667 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 | 7,781,015 | |
| -1 | -7,781,015 |
Let's try dividing by 4:
7,781,015 ÷ 4 = 1,945,253.75
If the quotient is a whole number, then 4 and 1,945,253.75 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 | 7,781,015 | |
| -1 | 7,781,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 23 | 55 | 115 | 253 | 1,265 | 6,151 | 30,755 | 67,661 | 141,473 | 338,305 | 707,365 | 1,556,203 | 7,781,015 |
| -1 | -5 | -11 | -23 | -55 | -115 | -253 | -1,265 | -6,151 | -30,755 | -67,661 | -141,473 | -338,305 | -707,365 | -1,556,203 | -7,781,015 |
Here are some more numbers to try:
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