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ITMC 2018 Grade 8 National Preliminary set01 Question 3

ITMC · ITMC 2018 Grade 8 National Preliminary set01

Question 3

Let $r$ be rational and $(r+\sqrt{18})^2=418+40\sqrt{18}$. Which statement is correct?
  1. $\sqrt{250}<r<\sqrt{300}$
  2. $\sqrt{300}<r<\sqrt{350}$
  3. $\sqrt{350}<r<\sqrt{400}$
  4. $\sqrt{350}<r<\sqrt{450}$
  5. $\sqrt{450}<r<\sqrt{500}$