( x - 1/x ) = 5SQUARE on both SIDES, ( x - 1/x )² = 5²=> x² + 1/x² - 2 = 25=> x² + 1/x² = 27 [ 1 answer ] Again square on both sides, => ( x² + 1/x² )² = 27²=> x⁴ + 1/x⁴ + 2 = 729=> x⁴ + 1/x⁴ = 727
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