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1952 AMC 12 Question 6

AMC12 · 1952 AMC 12

Question 6

The difference of the roots of $x^2-7x-9=0$ is:
  1. $+7$
  2. $+\dfrac72$
  3. $+9$
  4. $2\sqrt{85}$
  5. $\sqrt{85}$