railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Algebra Identities

If x + \(\frac{1}{x}\) = 2K, then what is the value of \(x^4+\frac{1}{x^4}\)? 

1
16K4 - 16K2 - 1
2
8K4 + 4K2 - 1
3
16K4 - 16K2 + 2
4
16K4 - 4K2 - 1
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