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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02 Question 10

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02

Question 10

How many integers $x$ satisfy $54\le x^2-3x\le180$?
  1. 28
  2. 27
  3. 14
  4. 12