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Fourth Root of 81: The expression for the fourth root of 81 is written as 814\sqrt[4]{81}481

The 4th root of 81, or 81 radical 3, is written as    <math xmlns="http://www.w3.org/1998/Math/MathML">
  <mroot>
    <mn>81</mn>
    <mn>4</mn>
  </mroot>
  <mo>=</mo>
  <mo>&#x00B1;<!-- ± --></mo>
  <mn>3</mn>
</math>