Question

value of 4root (81)^-2

Answer 1

$if\ the\ qn\ is :\ 4 * (81)^{-2}=\frac{4}{\sqrt{81}}=\frac{4}{9}\\\\if\ qn\ is:\ \ \sqrt[4]{81^{-2}} =\sqrt[4]{\frac{1}{81^2}}=\\\\=\sqrt[4]{\frac{1}{9^4}}=\frac{1}{9}$