x(x + 2 ) - (x + 3) (x - 1)/(x + 3) (x + 2) =1/14
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X² + 1/x² = 14
(x + 1/x)² -2.x.1/x = 14
(x + 1/x )² -2 = 14
(x + 1/x )² = 16
take square root both sides
(x + 1/x) = 4
then,
x³ + 1/x³ = ( x + 1/x)³ - 3.x.1/x(x + 1/x)
= ( x +1/x)³ -3(x + 1/x)
= (4)³ -3(4)
= 64 - 12
= 52
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