A:
Positive:
1 x 3887110855 x 777422177 x 5553015535 x 1110603137 x 10505705185 x 2101141259 x 15008151295 x 300163
Negative:
-1 x -388711085-5 x -77742217-7 x -55530155-35 x -11106031-37 x -10505705-185 x -2101141-259 x -1500815-1295 x -300163
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 388,711,085, 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 | 388,711,085 | |
| -1 | -388,711,085 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 388,711,085.
Example:
1 x 388,711,085 = 388,711,085
and
-1 x -388,711,085 = 388,711,085
Notice both answers equal 388,711,085
With that explanation out of the way, let's continue. Next, we take the number 388,711,085 and divide it by 2:
388,711,085 ÷ 2 = 194,355,542.5
If the quotient is a whole number, then 2 and 194,355,542.5 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 | 388,711,085 | |
| -1 | -388,711,085 |
Now, we try dividing 388,711,085 by 3:
388,711,085 ÷ 3 = 129,570,361.6667
If the quotient is a whole number, then 3 and 129,570,361.6667 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 | 388,711,085 | |
| -1 | -388,711,085 |
Let's try dividing by 4:
388,711,085 ÷ 4 = 97,177,771.25
If the quotient is a whole number, then 4 and 97,177,771.25 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 | 388,711,085 | |
| -1 | 388,711,085 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 37 | 185 | 259 | 1,295 | 300,163 | 1,500,815 | 2,101,141 | 10,505,705 | 11,106,031 | 55,530,155 | 77,742,217 | 388,711,085 |
| -1 | -5 | -7 | -35 | -37 | -185 | -259 | -1,295 | -300,163 | -1,500,815 | -2,101,141 | -10,505,705 | -11,106,031 | -55,530,155 | -77,742,217 | -388,711,085 |
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