Respuesta :

Answer:

[tex]→ \sqrt[4]{81 {x}^{8} {y}^{4} } \\ = {81}^{( \frac{1}{4})} {x}^{ (\frac{8}{4})}{y}^{ (\frac{4}{4})}\\= \boxed{3 {x}^{2} y}✓[/tex]

3x²y is the right answer.