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Australian AMC 2013 - Senior Question 21

AMC AUSTRALIA · Australian AMC 2013 - Senior

Question 21

If $x^2=x+3$ then $x^5$ equals
  1. $7x+12$
  2. $12x+7$
  3. $17x+17$
  4. $19x+21$
  5. $21x+19$