A:
Positive:
1 x 1203891555 x 2407783117 x 708171585 x 1416343433 x 2780352165 x 556073271 x 368057361 x 16355
Negative:
-1 x -120389155-5 x -24077831-17 x -7081715-85 x -1416343-433 x -278035-2165 x -55607-3271 x -36805-7361 x -16355
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 120,389,155, 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 | 120,389,155 | |
| -1 | -120,389,155 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,389,155.
Example:
1 x 120,389,155 = 120,389,155
and
-1 x -120,389,155 = 120,389,155
Notice both answers equal 120,389,155
With that explanation out of the way, let's continue. Next, we take the number 120,389,155 and divide it by 2:
120,389,155 ÷ 2 = 60,194,577.5
If the quotient is a whole number, then 2 and 60,194,577.5 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 | 120,389,155 | |
| -1 | -120,389,155 |
Now, we try dividing 120,389,155 by 3:
120,389,155 ÷ 3 = 40,129,718.3333
If the quotient is a whole number, then 3 and 40,129,718.3333 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 | 120,389,155 | |
| -1 | -120,389,155 |
Let's try dividing by 4:
120,389,155 ÷ 4 = 30,097,288.75
If the quotient is a whole number, then 4 and 30,097,288.75 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 | 120,389,155 | |
| -1 | 120,389,155 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 433 | 2,165 | 3,271 | 7,361 | 16,355 | 36,805 | 55,607 | 278,035 | 1,416,343 | 7,081,715 | 24,077,831 | 120,389,155 |
| -1 | -5 | -17 | -85 | -433 | -2,165 | -3,271 | -7,361 | -16,355 | -36,805 | -55,607 | -278,035 | -1,416,343 | -7,081,715 | -24,077,831 | -120,389,155 |
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