Answer:
[tex]\dfrac{\sqrt[5]{810x^3}}{3x}[/tex]
Step-by-step explanation:
As a rule, the "simplified form" means there are no fractions under a radical.
[tex]\sqrt[5]{\dfrac{10x}{3x^3}}=\sqrt[5]{\dfrac{10x(3^4x^2)}{3x^3(3^4x^2)}}=\sqrt[5]{\dfrac{810x^3}{(3x)^5}}=\boxed{\dfrac{\sqrt[5]{810x^3}}{3x}}[/tex]
