x + 1/x = 3 We need to find: x³ + 1/x³
- 9
- 18
- 21
- 27
Explanation
x³ + 1/x³ = (x + 1/x)³ − 3(x + 1/x)
= 3³ − 3×3
= 27 − 9
= 18
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