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Katlyn99

  • 3 years ago

Solve the following using the quadratic formula. Round to the nearest tenth, if necessary. x2 + 5x - 2 = 0 {-2, 5} {-5.4, 0.4} {-1, 0.5} No real solution

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  1. Mertsj
    • 3 years ago
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    Do you know the quadratic formula?

  2. Mertsj
    • 3 years ago
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    Look in you book. It's in there.

  3. Mertsj
    • 3 years ago
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    Did you find it?

  4. Katlyn99
    • 3 years ago
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    yes

  5. Mertsj
    • 3 years ago
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    So in your equation, a = 1, b = 5, and c = -2 Just plug in those numbers in place of the letters.

  6. Mertsj
    • 3 years ago
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    \[x=\frac{-5\pm \sqrt{5^2-4(1)(-2)}}{2(1)}\]

  7. Mertsj
    • 3 years ago
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    Does yours look like that so far?

  8. Katlyn99
    • 3 years ago
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    yes

  9. Mertsj
    • 3 years ago
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    \[x=\frac{-5\pm \sqrt{33}}{2}\]

  10. Mertsj
    • 3 years ago
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    Oh gees. They gave the answers in decimal form so now we need a calculator. Do you have one handy?

  11. Katlyn99
    • 3 years ago
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    yes

  12. Mertsj
    • 3 years ago
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    \[\frac{-5+\sqrt{33}}{2}=.37\approx .4\] \[\frac{-5-\sqrt{33}}{2}=-5.37\approx -5.4\]

  13. Mertsj
    • 3 years ago
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    Is that what you got?

  14. Katlyn99
    • 3 years ago
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    yes

  15. Mertsj
    • 3 years ago
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    Good job!!

  16. Katlyn99
    • 3 years ago
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    Thanks:)

  17. Mertsj
    • 3 years ago
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    you're welcome

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