Find eigenvalues of [[3, 1], [1, 3]]:
A1 and 1
B2 and 4 (det(A-λI) = (3-λ)² - 1 = 0 → 3-λ = ±1 → λ = 2 or 4)
C6 and 0
D3 and 1
Answer & Solution
Correct answer: B. 2 and 4 (det(A-λI) = (3-λ)² - 1 = 0 → 3-λ = ±1 → λ = 2 or 4)
(3-λ)² - 1 = 0 → 3 - λ = ±1 → λ = 2 or λ = 4. Trace = 6 ✓, det = 8 ✓.
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