defence exam DGAFMS Group C 2025 Mock Test Series Quantitative Aptitude Algebra Identities

If \(\rm x^2+\frac{1}{x^2}=40\) and x > 0 then, what is the value of \(\rm x-\frac{1}{x}\)?

1
\(\sqrt{38}\)
2
40
3
\(\sqrt{42}\)
4
\(\sqrt{21}\)
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