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1955 AMC 12 Question 32

AMC12 · 1955 AMC 12

Question 32

If the discriminant of $ax^2+2bx+c=0$ is zero, then another true statement about $a,$ $b,$ and $c$ is that:
  1. they form an arithmetic progression
  2. they form a geometric progression
  3. they are unequal
  4. they are all negative numbers
  5. only $b$ is negative and $a$ and $c$ are positive