A expressão equivale a:A) B) C) D) E) Divirtam-se. :)).... Pergunta de ideia deIzzyKoushiro

April 2020 1 241 Report

A expressão $\boxed{ \sqrt{7 + \sqrt{17} } * \sqrt{7 - \sqrt{17} } }$ equivale a:

A) $32.$

B) $49.$

C) $7 + \sqrt{17} .$

D) $4 \sqrt{2} .$

E) $5 \sqrt{2}.$

Divirtam-se. :))

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Verified answer

$\sqrt{7+ \sqrt{17} }. \sqrt{7- \sqrt{17} } = \\
\\
 \sqrt{(7+ \sqrt{17})(7-\sqrt{17}) } = \\
\\
 \sqrt{49-17} = \sqrt{32}=4\sqrt{2}$

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