exam Maths Puzzle Numerical Ability

Please,please,please I need your help! An application of a rational function is T = (AB)/(A+B), which gives the time, T, it takes for two worders to complete a particular task wher

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I am not sure how to do this problem. Thanks for your help!
Problem:
[((x+1 / x-1)+1) / ((x+1 / x-1)-1)]^5
What I have come up with:
[((x + 1/x -1)+1)*((x-1/x+1)-1)]^5

Find If R(x) is a rational function, then R(x) < 0 describes what?
a)The values of x that make R(x) positive in value
b)The values of R(x) that make x negative in value
c)The values