Answer
$\color{blue}{3|p^3q|}$
Work Step by Step
RECALL:
If $n$ is an even integer, $\sqrt[n]{a^n} = |a|$
Using the rule above gives:
$\sqrt[4]{81p^{12}q^4}
\\=\sqrt[4]{3^4p^{12}q^4}
\\= {|3p^3q|}
\\=\color{blue}{3|p^3q|}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.