Question

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Answer 1

Recuerda que:

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

...

$R = ( \sqrt{5+2 \sqrt{6}} )( \sqrt{5 - 2 \sqrt{6} } ) \\ R = \sqrt{(5 + 2 \sqrt{6})(5 - 2 \sqrt{6} ) } \\ R = \sqrt{ {5}^{2} - {(2 \sqrt{6} )}^{2} } \\ R = \sqrt{25 - 24} \\ R = \sqrt{1} \\ R = 1$

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