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.
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Simplify the numerator.
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One to any power is one.
Multiply by .
Multiply by .
Add and .
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