( X + 1 / x ) = 3Squaring both sides,( x + 1 / x ) ^ 2 = 3 ^ 2x ^ 2 + 1 / x ^ 2 + 2 * x * 1 /x = 9x ^ 2 + 1 / x ^ 2 + 2 = 9x ^ 2 + 1 / x ^ 2 = 9 -2 x ^ 2 + 1 / x ^ 2 = 7.
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