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douglas12

  • 2 years ago

Solve the equation: x^2 + 5x + 22 = 0 A. 0 B. -2.5 C. 15.75 D. No solution

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  1. uri
    • 2 years ago
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    @douglas12 Quad equation?

  2. douglas12
    • 2 years ago
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    I think so.

  3. uri
    • 2 years ago
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    Use the quad formula : http://blogs.discovermagazine.com/loom/files/2008/07/quadratic.jpg

  4. uri
    • 2 years ago
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    a:1 b:5 c:22

  5. douglas12
    • 2 years ago
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    so is the answer B

  6. abb50
    • 2 years ago
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    to check, substitute is (-2.5)^2 + 5(-2.5) + 22 = 0? if yes, then you're right. if not, try again

  7. douglas12
    • 2 years ago
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    No it's not 0

  8. abb50
    • 2 years ago
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    then pick another letter and keep on substituting. i for one think it's faster (only applicable in multiple choice questions)

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