Simplify the Radical Expression fourth root of 81

$\sqrt[4]{81}$

Rewrite $81$ as $3^{4}$ .

$\sqrt[4]{3^{4}}$

Pull terms out from under the radical.

$| 3 |$

The absolute value is the distance between a number and zero. The distance between $0$ and $3$ is $3$ .

$3$