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Kagome_gurl8

  • 2 years ago

Use the Quadratic Formula to solve the equation. –x2 – x – 5 = 0

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  1. Kagome_gurl8
    • 2 years ago
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    @Hero

  2. Kagome_gurl8
    • 2 years ago
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    -x^2*

  3. Hero
    • 2 years ago
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    \[–x^2 – x – 5 = 0\] 1st I would factor out -1: \[-(x^2 + x + 5) = 0\] Then divide both sides by -1 \[x^2 + x + 5 = 0\] Now I would use quadratic formula: \[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\] a = 1, b = 1, c = 5

  4. Kagome_gurl8
    • 2 years ago
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    Oh, thank you very much :)

  5. Hero
    • 2 years ago
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    Well, actually, hang on

  6. Hero
    • 2 years ago
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    When in doubt, compute the discriminant to see if this is even has any real solution

  7. Hero
    • 2 years ago
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    b^2 - 4ac = (1)^2 - 4(1)(5) = 1 - 20 = -19 No real solution

  8. Kagome_gurl8
    • 2 years ago
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    Thats what i got also, i wanted to make sure i was doing it right. :)

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