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Question

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Simplify:

\(\sqrt {11 - 2\sqrt {30} }\)

  1. \(\sqrt 6 + \sqrt 5 \)
  2. 6
  3. \(\sqrt 6 - \sqrt 5\)
  4. \(6 - \sqrt 5\)

Answer (Detailed Solution Below)

Option 3 : \(\sqrt 6 - \sqrt 5\)
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Detailed Solution

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\(\begin{array}{l} \sqrt {11 - 2\sqrt {30} } \\ = \sqrt {\left( {11} \right) - 2\sqrt 6 \times \sqrt 5 } \\ = \sqrt {\left( {6 + 5} \right) - 2\sqrt 6 \times \sqrt 5 } \\ = \sqrt {{{\left( {\sqrt 6 } \right)}^2} + {{\left( {\sqrt 5 } \right)}^2} - 2\sqrt 6 \times \sqrt 5 } \\ = \sqrt {{{\left( {\sqrt 6 - \sqrt 5 } \right)}^2}} \\ = \sqrt 6 - \sqrt 5 \end{array}\)
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