Quantitative Aptitude Algebra Identities

If \({\rm x} + \frac{1}{{\rm x}} = - 14 \), and x < -1, what will be the value of \({{\rm x}^2} - \frac{1}{{{{\rm x}^2}}}\) ?

1
- 112√3  
2
112√3  
3
-140√2  
4
140√2  

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