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1957 AMC 12 Question 40

AMC12 · 1957 AMC 12

Question 40

If the parabola $y=-x^2+bx-8$ has its vertex on the $x$-axis, then $b$ must be:
  1. a positive integer
  2. a positive or a negative rational number
  3. a positive rational number
  4. a positive or a negative irrational number
  5. a negative irrational number