Question

the value of
$4 \sqrt({81})^{ - 2}$
​

Answer 1

4 * sqrt{(81)^(-2)}
= 4 * {81^(-2 * (1/2))}
= 4 * 81^-1
= 4 * 1/81
= 4/81. ANSWER

Sqrt can we written as :
Sqrt(n) where n is any number
= n^(1/2)