Question 394033
Perhaps you meant SIMPLIFY.

{{{(a^(1/2)b^(3/8))/(a^(1/4)b^(1/8)) = a^(1/2 - 1/4)b^(3/8 - 1/8)}}} 
={{{a^(1/4)b^(1/4) = (ab)^(1/4) = root(4, ab)}}}