Question

$- \sqrt{4 - 2 \sqrt{9 + \sqrt{16} } }$
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Answer 1

$\sf - \sqrt{4 - 2 \sqrt{9 + \sqrt{16} } } \\ \\\sf - \sqrt{4 - 2 \sqrt{13} } \\ \\\sf \red{ - \sqrt{2( 2 - \sqrt{13} )}}$