9. (2 points) For $A = \begin{pmatrix} 1 & 2 & 3 \\ 1 & 2 & 3 \\ 1 & 2 & 3 \end{pmatrix}$, with very little computation show that one eigenvalue of A is $\lambda = 0$.
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Step 1: To find the eigenvalues of a matrix, we need to solve the characteristic equation det(A - λI) = 0, where A is the matrix, λ is the eigenvalue, and I is the identity matrix. Show more…
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