az^2+bz+c=0
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Recent Referers:
  1. http://formula.s21g.com/?az%5E2+bz+c%3D0
  2. http://formula.s21g.com/
  3. http://blog.s21g.com/articles/2012.8
  4. http://blog.s21g.com/articles/2293
  5. http://t.co/vp5cjh6R0n