Question

pls tell this ans with full explanation ​

Answer 1

$\sqrt[4]{81 {}^{ - 2} }$

${3}^{ - 2}$

$\frac{1}{ {3}^{2} }$

$\frac{1}{9}$

Hope it helps you...........

Answer 2

$= \sqrt[4]{ {81}^{ - 2} } \\ = \sqrt[4]{ \frac{1}{81} } \\ =( { \frac{1}{81} )}^{ \frac{1}{4} } \\ = ( { \frac{1}{3} )}^{4} \times {}^{ \frac{1}{4} } \\ = \frac{1}{3}$