Question

pls tell this ans with full explanation value of 1 st ​

Answer 1

See,

whenever there is any negative exponent to any number ... the number gets inversed with the same power

for example x^-1=1/x^1=1/X

so, in this question

it is given

$\sqrt[4]{ {81}^{ - 2} } \\ {81}^{ - 2} = \frac{1}{ {81}^{2} } = \frac{1}{ {( {9}^{2} )}^{2} } = \frac{1}{ {9}^{4} } \\ \sqrt[4]{x } = {x}^{\frac{1}{4} } \\ so \\ \\ \sqrt[4]{ \frac{1}{ {9}^{4} } } = \frac{1}{ {9}^{4 \times \frac{1}{4} } } = \frac{1}{9}$

Answer 2

$\huge{\underline{\mathbb{\red{ANSWER:-}}}}$$\\ \huge\frac{1}{9}$