Question 6
Let $a$ be real and $a^2-2a-1=0$. Compute $a^4-6a^2+5$.
HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01 Question 6
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01