# 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 eight hundred twenty-four million four hundred seventy-seven thousand five hundred

### Interesting facts

• 1824477500 has 32 divisors, whose sum is 4965504768
• The reverse of 1824477500 is 0057744281
• Previous prime number is 5

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 38
• Digital Root 2

### Name

Name one billion five hundred thirty million seven hundred fifty-eight thousand three hundred twenty-seven

### Interesting facts

• 1530758327 has 8 divisors, whose sum is 1751719200
• The reverse of 1530758327 is 7238570351
• Previous prime number is 769

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 41
• Digital Root 5

### Name

Name one billion six hundred sixty-one million two hundred nineteen thousand nine hundred twenty-five

### Interesting facts

• 1661219925 has 8 divisors, whose sum is 2126361600
• The reverse of 1661219925 is 5299121661
• Previous prime number is 5

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 42
• Digital Root 6