Answer
$-3x^4y^3$
Work Step by Step
$\sqrt[3] {-27x^{12}y^9}=-3x^4y^3$
because,
$(-3x^4y^3)^3=-27x^{12}y^9$
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.