Hello !!X + 1/X = 3Cubing on both sides,( X + 1/X )³ = (3)³Using identity , ( A + B)³ = (A)³ + (B)³ + 3AB ( A + B ).( X )³ + 1/X³ + 3X × 1/X ( X + 1/X ) = 27X³ + 1/X³ + 3 × 3 = 27X³ + 1/X³ = 27 - 9X³ + 1/X³ = 18.
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