Is there additional information available for your question? I am not exactly sure what your question is asking. There are a couple of examples that I could provide. For example, you could have sqrt(sqrt(25)). In this case, I would evaluate the inner square root of 25 which would give me 5. Then, I would proceed to the outer square root and get an answer of sqrt(5). Another example would be the sqrt(sqrt(x)). We could write this as sqrt(x^1/2) because we can write the square root as 1/2. Then, we could write (x^1/2)^1/2. Since this is a power raised to a power (or step ladder as I call it), we would multiple the exponents and end up with x^1/4 which could also be written as the 4th root of x.