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IMAS 2020–2021 Junior Round 2 Question 5

IMAS · IMAS 2020–2021 Junior Round 2

Question 5

Given that $x^2=x+1$, which of the following algebraic equations is equal to $x^8$?
  1. $4x+4$
  2. $8x+5$
  3. $13x+8$
  4. $16x+10$
  5. $21x+13$