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BBB 2022 - Secondary 3 - Preliminary Round Question 5

BBB · BBB 2022 - Secondary 3 - Preliminary Round

Question 5

Given $x>0$ and $x-\frac1x=3$, find the value of $x^4+\frac1{x^4}$.
  1. 47
  2. 51
  3. 123
  4. 119