Question

$( \sqrt{7 + \sqrt{9)( \sqrt{7 - \sqrt{9) = } } } }$
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Answer 1

$\LARGE\textbf{\underline{\underline{✪\: \: \: Answer :-}}}$

$\large\: \bigstar\textsf\textcolor{orange}{\: \: \: ( \sqrt{7} + \sqrt{9} ) × ( \sqrt{7} - \sqrt{9} ) }$

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➛ This equation is in the form of :-

$\large:\: \bigstar\textsf\textcolor{orange}{\: \: \: ( a + b )(a - b ) = a² - b² .}$

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➛ Here :-

↦ a = √7

↦ b = √9

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$\large:\: \bigstar\textsf\textcolor{orange}{\: \: \: ( \sqrt{7} + \sqrt{9} ) × ( \sqrt{7} - \sqrt{9} ) = ( \sqrt{7} ) ^{2} - ( \sqrt{9} ) ^ {2} }\\\\\\\large: \: \Longrightarrow\textsf{= 7 - 9 }\\\\\\\large : \: \Longrightarrow\underline{\boxed{\textsf\textcolor{magenta}{ ( \sqrt{7} + \sqrt{9} ) × \sqrt{7} - \sqrt{9} = - 2 }}}$

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$\Large: \: \Longrightarrow\boxed{\mathfrak\textcolor{red}{Option \: \: \: ( B ) \: \: - 2}}$

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