How to Enter [x]/x on TI-84 Plus Calculator: Simple Notation Question

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Hello! I just was wondering how to enter [x]/x into my calculator to get a graph. When I try, I get a syntax error. Thank you for your help! BTW: I have a TI-84 plus!
 
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The simplest would be to write: \frac{\sqrt{x^{2}}}{x}
 
thank you!
 

Thread 'Finding the nth roots of a complex number'

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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