Question

4root (81)^-2 pls tell

Answer 1

4*1/81 is your ans...
or 1/3is your ans...

Answer 2

$\textbf{ Hello Mate! }$

$4 \sqrt{ {81}^{ - 2} } \\ 4 \sqrt{ {( {3}^{4} )}^{ - 2} } = 4 \times {3}^{ \frac{1}{2} \times - 2 \times 4} \\ 4 \times {3}^{ - 4} = 4 \times \frac{1}{81} \\ \frac{4}{81}$
$\boxed{ Answer : 4 / 81 }$

Have great future ahead!