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Australian AMC 2017 - Intermediate Question 18

AMC AUSTRALIA · Australian AMC 2017 - Intermediate

Question 18

The identity \(a(a^9-a^8)+a^9=a^x\) is true for all a. The value of x is
  1. 0
  2. 1
  3. 8
  4. 9
  5. 10