Answer
$x\sqrt[3] {y^2}$.
Work Step by Step
The given expression is
$=\sqrt[6] {x^6y^4}$
Rewrite as an exponential expression.
$=(x^6y^4)^{\frac{1}{6}}$
Raise each factor in parentheses to the $\frac{1}{3}$ power.
$=(x^6)^{\frac{1}{6}}(y^4)^{\frac{1}{6}}$
Use power rule.
$=x^{\frac{6}{6}}y^{\frac{4}{6}}$
Simplify.
$=x^1y^{\frac{2}{3}}$
Rewrite in radical notation.
$=x\sqrt[3] {y^2}$.