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130
Step-by-step explanation:
x - 1/x = 5
=> (x - 1/x)² = 25
=> x² + 1/x² - 2(x)(1/x) = 25
=> x² + 1/x² = 27
(x² + 1/x²) (x - 1/x) = (27)(5) = 135
=> x³ - x + 1/x - 1/x³ = 135
=> x³ - 1/x³ = 135 + ( x - 1/x ) = 135 - 5 = 130
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