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SMO 2008 Junior Round 1 Question 2

SMO · SMO 2008 Junior Round 1

Question 2

Given that $\sqrt{2x+y}+\sqrt{x^2-9}=0$, find the value(s) of $y-x$.
  1. $-9$
  2. $-6$
  3. $-9$ or $9$
  4. $-3$ or $3$
  5. None of the above