Question

Express $\frac{1}{81}$ in exponential form.

• A. $3^{-4}$
• B. $3^{-3}$
• C. $3^4$
• D. $3^3$

Answer 1

The correct option is A

$3^{-4}$

Given, $\frac{1}{81}$

$\Rightarrow$ $\frac{1}{3^4}$

$\Rightarrow$ $3^{-4}$ [ $\frac{1}{a^m}=a^{-m}$]