If $\sqrt{x} = 7$, then $x^{2}$ equals

If $\sqrt{x} = 7$, then $x^{2}$ equals
  1. $2401$
  2. $49$
  3. $343$
  4. $14$

Solution

$x = 49$, so $x^{2} = 49^{2} = 2401$.

Asked in: IMO

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