Proving Ideal of R/J is Contained in I of R Containing J

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Homework Statement


Suppose that J is an ideal of R, and consider the ring R/J = {r + J | r 2 R}.
Prove that X is an ideal of R/J is and only if there is an ideal I of R containing J such
that J c I c R.


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The Attempt at a Solution

 
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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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