A:
Positive:
1 x 428780055 x 857560137 x 115886541 x 1045805185 x 231773205 x 2091611517 x 282655653 x 7585
Negative:
-1 x -42878005-5 x -8575601-37 x -1158865-41 x -1045805-185 x -231773-205 x -209161-1517 x -28265-5653 x -7585
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 42,878,005, 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 | 42,878,005 | |
| -1 | -42,878,005 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 42,878,005.
Example:
1 x 42,878,005 = 42,878,005
and
-1 x -42,878,005 = 42,878,005
Notice both answers equal 42,878,005
With that explanation out of the way, let's continue. Next, we take the number 42,878,005 and divide it by 2:
42,878,005 ÷ 2 = 21,439,002.5
If the quotient is a whole number, then 2 and 21,439,002.5 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 | 42,878,005 | |
| -1 | -42,878,005 |
Now, we try dividing 42,878,005 by 3:
42,878,005 ÷ 3 = 14,292,668.3333
If the quotient is a whole number, then 3 and 14,292,668.3333 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 | 42,878,005 | |
| -1 | -42,878,005 |
Let's try dividing by 4:
42,878,005 ÷ 4 = 10,719,501.25
If the quotient is a whole number, then 4 and 10,719,501.25 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 | 42,878,005 | |
| -1 | 42,878,005 |
If you did it right, you will end up with this table:
| 1 | 5 | 37 | 41 | 185 | 205 | 1,517 | 5,653 | 7,585 | 28,265 | 209,161 | 231,773 | 1,045,805 | 1,158,865 | 8,575,601 | 42,878,005 |
| -1 | -5 | -37 | -41 | -185 | -205 | -1,517 | -5,653 | -7,585 | -28,265 | -209,161 | -231,773 | -1,045,805 | -1,158,865 | -8,575,601 | -42,878,005 |
Here are some more numbers to try:
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