Question

(
$( \sqrt{5 \: - \: \: \: \sqrt{2)( \sqrt{5 + \sqrt{2} } } } )$
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Answer 1

Answer:

$( \sqrt{5} - \sqrt{2} )( \sqrt{5} + \sqrt{2} ) \\ ( \sqrt{5} ) {}^{2} - ( \sqrt{2} ) \\ 25 - 4 = 21$