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1957 AMC 12 Question 22

AMC12 · 1957 AMC 12

Question 22

If $\sqrt{x-1}-\sqrt{x+1}+1=0,$ then $4x$ equals:
  1. $5$
  2. $4\sqrt{-1}$
  3. $0$
  4. $1\frac14$
  5. no real value