A:
Positive:
1 x 7802145123 x 339223731 x 251682173 x 1068787713 x 1094271499 x 520491679 x 464692263 x 34477
Negative:
-1 x -78021451-23 x -3392237-31 x -2516821-73 x -1068787-713 x -109427-1499 x -52049-1679 x -46469-2263 x -34477
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 78,021,451, 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 | 78,021,451 | |
| -1 | -78,021,451 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,021,451.
Example:
1 x 78,021,451 = 78,021,451
and
-1 x -78,021,451 = 78,021,451
Notice both answers equal 78,021,451
With that explanation out of the way, let's continue. Next, we take the number 78,021,451 and divide it by 2:
78,021,451 ÷ 2 = 39,010,725.5
If the quotient is a whole number, then 2 and 39,010,725.5 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 | 78,021,451 | |
| -1 | -78,021,451 |
Now, we try dividing 78,021,451 by 3:
78,021,451 ÷ 3 = 26,007,150.3333
If the quotient is a whole number, then 3 and 26,007,150.3333 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 | 78,021,451 | |
| -1 | -78,021,451 |
Let's try dividing by 4:
78,021,451 ÷ 4 = 19,505,362.75
If the quotient is a whole number, then 4 and 19,505,362.75 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 | 78,021,451 | |
| -1 | 78,021,451 |
If you did it right, you will end up with this table:
| 1 | 23 | 31 | 73 | 713 | 1,499 | 1,679 | 2,263 | 34,477 | 46,469 | 52,049 | 109,427 | 1,068,787 | 2,516,821 | 3,392,237 | 78,021,451 |
| -1 | -23 | -31 | -73 | -713 | -1,499 | -1,679 | -2,263 | -34,477 | -46,469 | -52,049 | -109,427 | -1,068,787 | -2,516,821 | -3,392,237 | -78,021,451 |
Here are some more numbers to try:
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