Question

please help............​

Answer 1

We know ,

$\\ \sf\large\green{\underline { }} {a}^{ - b} = \frac{1}{ {a}^{b} }$

$\sf\large\green{\underline { }} \sqrt[4]{ {80}^{ - 2} } \\ \\ \sf\large\green{\underline { }} = \sqrt[4]{ \frac{1}{ {81}^{2} } } \\ \\ \sf\large\green{\underline { }} = \sqrt[4]{ \frac{1}{( { {9}^{2}) }^{2} } } \\ \\ \sf\large\green{\underline { }} = \sqrt[4]{ \frac{1}{ {9}^{4} } } \\ \\ = \sf\large\green{{ \frac{1}{9} }} \: \: \: \: \: \: option \: (a)$

Mark as brainliest......✌✌