Square Root and Cube Root - Arithmetic Aptitude Questions and Answers

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The square root of (7 + 3 $\sqrt{5}$ ) (7 - 3 $\sqrt{5}$ ) is

$\sqrt{5}$

3 $\sqrt{5}$

Answer : Option B

Explanation :

$\sqrt{(7+3\sqrt{5})(7-€‹€‹€‹3\sqrt{5})}$ = $\sqrt{(7)^2-(3\sqrt{5})^2}$ = $\sqrt{49-45}$ = $\sqrt{4}$ =2

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