Which of the following is a surd?

$\sqrt[4]{81}$

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$\sqrt[3]{8}$

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$\sqrt[4]{36}$

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$\sqrt[3]{64}$

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Solution

The correct option is C
$\sqrt[4]{36}$

$\sqrt[4]{81} = 3 w h i c h i s a r e a l n u m b e r$

$\sqrt[3]{8} = 2 w h i c h i s a r e a l n u m b e r$

$\sqrt[4]{36} = \sqrt[2]{6} w h i c h i s a q u a d r a t i c s u r d$

$\sqrt[3]{64} = 4 w h i c h i s a r e a l n u m b e r$

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