# Solve by Factoring x^2-4x-5=0

Solve by Factoring x^2-4x-5=0
Factor using the AC method.
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 and solve.
Set the first factor equal to .
Add to both sides of the equation.
Set the next factor equal to and solve.
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 seventeen million four hundred fifty-seven thousand six

### Interesting facts

• 1017457006 has 16 divisors, whose sum is 1556047584
• The reverse of 1017457006 is 6007547101
• Previous prime number is 53

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 31
• Digital Root 4

### Name

Name four hundred sixty-five million five hundred eighty-one thousand six hundred seventy-eight

### Interesting facts

• 465581678 has 4 divisors, whose sum is 698372520
• The reverse of 465581678 is 876185564
• Previous prime number is 2

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 50
• Digital Root 5

### Name

Name three hundred seven million seven hundred seventy-three thousand nine hundred forty-eight

### Interesting facts

• 307773948 has 32 divisors, whose sum is 705423600
• The reverse of 307773948 is 849377703
• Previous prime number is 257

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 48
• Digital Root 3