# Solve Using the Quadratic Formula x^2+x-1=0

Solve Using the Quadratic Formula x^2+x-1=0
Use the quadratic formula to find the solutions.
Substitute the values , , and into the quadratic formula and solve for .
Simplify.
Simplify the numerator.
One to any power is one.
Multiply by .
Multiply by .
Multiply by .
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
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### Name

Name one billion nine hundred ninety-three million five hundred eighty-five thousand three hundred ninety-seven

### Interesting facts

• 1993585397 has 8 divisors, whose sum is 2055151680
• The reverse of 1993585397 is 7935853991
• Previous prime number is 59

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 59
• Digital Root 5

### Name

Name one billion three hundred eighty million four hundred thirty-one thousand one hundred seventy

### Interesting facts

• 1380431170 has 16 divisors, whose sum is 2488054968
• The reverse of 1380431170 is 0711340831
• Previous prime number is 761

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 28
• Digital Root 1

### Name

Name one hundred twelve million one hundred sixty-six thousand nine hundred seven

### Interesting facts

• 112166907 has 8 divisors, whose sum is 149621760
• The reverse of 112166907 is 709661211
• Previous prime number is 13751

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 9
• Sum of Digits 33
• Digital Root 6