A:
Positive:
1 x 4010215155 x 80204303257 x 1560395521 x 769715599 x 6694851285 x 3120792605 x 1539432995 x 133897
Negative:
-1 x -401021515-5 x -80204303-257 x -1560395-521 x -769715-599 x -669485-1285 x -312079-2605 x -153943-2995 x -133897
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 401,021,515, 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 | 401,021,515 | |
| -1 | -401,021,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 401,021,515.
Example:
1 x 401,021,515 = 401,021,515
and
-1 x -401,021,515 = 401,021,515
Notice both answers equal 401,021,515
With that explanation out of the way, let's continue. Next, we take the number 401,021,515 and divide it by 2:
401,021,515 ÷ 2 = 200,510,757.5
If the quotient is a whole number, then 2 and 200,510,757.5 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 | 401,021,515 | |
| -1 | -401,021,515 |
Now, we try dividing 401,021,515 by 3:
401,021,515 ÷ 3 = 133,673,838.3333
If the quotient is a whole number, then 3 and 133,673,838.3333 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 | 401,021,515 | |
| -1 | -401,021,515 |
Let's try dividing by 4:
401,021,515 ÷ 4 = 100,255,378.75
If the quotient is a whole number, then 4 and 100,255,378.75 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 | 401,021,515 | |
| -1 | 401,021,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 257 | 521 | 599 | 1,285 | 2,605 | 2,995 | 133,897 | 153,943 | 312,079 | 669,485 | 769,715 | 1,560,395 | 80,204,303 | 401,021,515 |
| -1 | -5 | -257 | -521 | -599 | -1,285 | -2,605 | -2,995 | -133,897 | -153,943 | -312,079 | -669,485 | -769,715 | -1,560,395 | -80,204,303 | -401,021,515 |
Here are some more numbers to try:
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