Answer
$\color{blue}{-3\sqrt[4]{3}}$
Work Step by Step
Factor the radicand so that one factor is a perfect fourth power to obtain:
$=-\sqrt[4]{81(3)}
\\=-\sqrt[4]{3^4(3)}$
Bring out the fourth root of the perfect fourth power factor to obtain:
$=\color{blue}{-3\sqrt[4]{3}}$
