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S

  • 3 years ago

how to find x in x^2-x-1 ?

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  1. radar
    • 3 years ago
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    As is, you do not have an equation. What is that expression equal to?

  2. S
    • 3 years ago
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    to 0

  3. lgbasallote
    • 3 years ago
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    |dw:1337559134977:dw| i found x

  4. radar
    • 3 years ago
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    The quadratic formula seems like a good candiate. OMG lgbasallote has already found x!

  5. lgbasallote
    • 3 years ago
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    teachers should phrase it as solve for x :P find x is tooo easy (unless x happens to be wally)

  6. S
    • 3 years ago
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    that was not helpful at all , but I understand your point

  7. lgbasallote
    • 3 years ago
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    on a helpful note though...use either completing the square or q.f.

  8. lgbasallote
    • 3 years ago
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    it is not factorable...i can give you that

  9. radar
    • 3 years ago
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    \[x ^{2}+x-1=0\]A=1 B=1 C=-1 Use quadratic formula.

  10. akamushi
    • 3 years ago
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    C would be +1, when you move it to the other side of the equation

  11. radar
    • 3 years ago
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    x=[-1+/-sqrt(1+4]/2 \[=(-1\pm \sqrt{5})/2\]

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spraguer (Moderator)
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