A:
Positive:
1 x 420051055 x 840102119 x 221079595 x 442159139 x 302195695 x 604392641 x 159053181 x 13205
Negative:
-1 x -42005105-5 x -8401021-19 x -2210795-95 x -442159-139 x -302195-695 x -60439-2641 x -15905-3181 x -13205
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 42,005,105, 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 | 42,005,105 | |
| -1 | -42,005,105 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 42,005,105.
Example:
1 x 42,005,105 = 42,005,105
and
-1 x -42,005,105 = 42,005,105
Notice both answers equal 42,005,105
With that explanation out of the way, let's continue. Next, we take the number 42,005,105 and divide it by 2:
42,005,105 ÷ 2 = 21,002,552.5
If the quotient is a whole number, then 2 and 21,002,552.5 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 | 42,005,105 | |
| -1 | -42,005,105 |
Now, we try dividing 42,005,105 by 3:
42,005,105 ÷ 3 = 14,001,701.6667
If the quotient is a whole number, then 3 and 14,001,701.6667 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 | 42,005,105 | |
| -1 | -42,005,105 |
Let's try dividing by 4:
42,005,105 ÷ 4 = 10,501,276.25
If the quotient is a whole number, then 4 and 10,501,276.25 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 | 42,005,105 | |
| -1 | 42,005,105 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 139 | 695 | 2,641 | 3,181 | 13,205 | 15,905 | 60,439 | 302,195 | 442,159 | 2,210,795 | 8,401,021 | 42,005,105 |
| -1 | -5 | -19 | -95 | -139 | -695 | -2,641 | -3,181 | -13,205 | -15,905 | -60,439 | -302,195 | -442,159 | -2,210,795 | -8,401,021 | -42,005,105 |
Here are some more numbers to try:
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