Find all the eigen values of $A - 3I$, where $A = \begin{bmatrix} 2 &…

Previous year question for Engineering Mathematics-II.

Question

Find all the eigen values of $A - 3I$, where $A = \begin{bmatrix} 2 & 0 & 1 \\ 0 & 2 & 0 \\ 1 & 0 & 2 \end{bmatrix}$