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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 04 Question 10

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 04

Question 10

Find the maximum of $-x^2+12x-19$.
  1. $-19$
  2. 19
  3. $-55$
  4. 17