railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra Identities

If \(\rm x+\frac{1}{x}=9\), then the value of \(\rm x^2+\frac{1}{x^2}\) is:

1
83
2
81
3
79
4
81.01
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