anonymous
  • anonymous
Solve the equation: x^2 + 5x + 22 = 0 A. 0 B. -2.5 C. 15.75 D. No solution
Mathematics
chestercat
  • chestercat
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uri
  • uri
@douglas12 Quad equation?
anonymous
  • anonymous
I think so.
uri
  • uri
Use the quad formula :http://blogs.discovermagazine.com/loom/files/2008/07/quadratic.jpg

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uri
  • uri
a:1 b:5 c:22
anonymous
  • anonymous
so is the answer B
anonymous
  • anonymous
to check, substitute is (-2.5)^2 + 5(-2.5) + 22 = 0? if yes, then you're right. if not, try again
anonymous
  • anonymous
No it's not 0
anonymous
  • anonymous
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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