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HKIMO 2026 Grade 8 National Preliminary Set 02 Question 7

HKIMO · HKIMO 2026 Grade 8 National Preliminary Set 02

Question 7

Given $a+b=9$ and $a^2+b^2=45$, find $|b-a|$.
  1. 3
  2. 6
  3. 2
  4. 1