Find all values λ such that the matrix B(λ) is singular, where
B(\lambda)=\left[\begin{array}{ccc}2-\lambda & 0 & 0 \\2 & 3-\lambda & 4 \\1 & 2 & 1-\lambda\end{array}\right].
Find all values λ such that the matrix B(λ) is singular, where
B(\lambda)=\left[\begin{array}{ccc}2-\lambda & 0 & 0 \\2 & 3-\lambda & 4 \\1 & 2 & 1-\lambda\end{array}\right].