For this case, what you should know is that for the same base the exponents are added.
We have then:
base = 5
Exponents = (1/2) and (1/3)
Solving the product we have:
(sqrt 5) * (^ 3 sqrt 5) = 5 ^ ((1/2) + (1/3)) = 5 ^ (5/6)
answer
(sqrt 5) * (^ 3 sqrt 5) = 5 ^ (5/6)