Solve by Factoring x^2-4x-5=0
Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Write the factored form using these integers.
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Set the first factor equal to .
Add to both sides of the equation.
Set the next factor equal to .
Subtract from both sides of the equation.
The final solution is all the values that make true.
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Name
| Name | one billion five hundred seventy-nine million seven hundred three thousand four hundred fifteen |
|---|
Interesting facts
- 1579703415 has 8 divisors, whose sum is 2128442880
- The reverse of 1579703415 is 5143079751
- Previous prime number is 95
Basic properties
- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 42
- Digital Root 6
Name
| Name | one hundred million six hundred forty-seven thousand nine hundred sixty-four |
|---|
Interesting facts
- 100647964 has 32 divisors, whose sum is 230072400
- The reverse of 100647964 is 469746001
- Previous prime number is 1051
Basic properties
- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 37
- Digital Root 1
Name
| Name | one billion eighty-four million eight hundred eighty-four thousand four hundred sixty-five |
|---|
Interesting facts
- 1084884465 has 8 divisors, whose sum is 1095909408
- The reverse of 1084884465 is 5644884801
- Previous prime number is 2683
Basic properties
- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 48
- Digital Root 3