Ononot — Let C = \begin{pmatrix} 1 & 2 & 3 \\ 3 & 1 & 2 \\ 2 & 3 & 1

Eigenvalues & Eigenvectorsmedium

0:00.0

Let $C = \begin{pmatrix} 1 & 2 & 3 \\ 3 & 1 & 2 \\ 2 & 3 & 1 \end{pmatrix}$ be a circulant matrix. Which of the following is a real eigenvalue of $C$ ?