problem solving functions



If I try solving functions with fractional exponents I get results 
containing a variable again...

e.g: solve(5*x^(1/5)-3*x^2=0,x);

-> [x=-(sqrt(5)*x^(1/10))/sqrt(3),x=(sqrt(5)*x^(1/10))/sqrt(3)]

What am I doing wrong?

Cheers

Maxx