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BBB 2022 - Secondary 2 - Preliminary Round Question 8

BBB · BBB 2022 - Secondary 2 - Preliminary Round

Question 8

Given $x>0$ and $x-\frac1x=3$, find the value of $x^3-\frac1{x^3}$.
  1. 18
  2. 27
  3. 30
  4. 36