Finding D: Solving for Surface Area of Function

asi123
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Homework Statement



I have this function, and I need to find the Surface area of the function that is confined between the plains x=0, y=0 and z=0.
My question is, what's D?

Homework Equations





The Attempt at a Solution

 

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Ok, I got it, sorry.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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