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Eigenvalues & Eigenvectorsmedium
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A 4×44 \times 44×4 real matrix AAA has characteristic polynomial p(λ)=(λ−1)(λ−2)(λ2+6λ+13)p(\lambda) = (\lambda - 1)(\lambda - 2)(\lambda^2 + 6\lambda + 13)p(λ)=(λ−1)(λ−2)(λ2+6λ+13). Which statement about the eigenvalues of AAA must be true?