If $x^{3} = 729$, then $x^{2}$ equals

If $x^{3} = 729$, then $x^{2}$ equals
  1. $81$
  2. $27$
  3. $243$
  4. $9$

Solution

$x = 9$, so $x^{2} = 81$.

Asked in: IMO

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