Quantitative Aptitude Algebra Identities

ಒಂದು ವೇಳೆ x2 - 7x + 1 = 0 ಮತ್ತು 0 < x < 1 ಆಗಿದ್ದರೆ, x2 - \(\frac{1}{x^2}\) ನ ಮೌಲ್ಯ ಏನು?

1
\(21 \sqrt{5} \)
2
\(-21 \sqrt{5} \)
3
\(28 \sqrt{5} \)
4
\(-28 \sqrt{5} \)

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