Let $M=\left[\begin{array}{lll}1 & 2 & 2 \ 2 & 1 & 2 \ 2 & 2 & 1\end{array} ight]$ and $I$ be the identity matrix of order 3 . Then $M^2-4 M=$

Question

Let $M=\left[\begin{array}{lll}1 & 2 & 2 \ 2 & 1 & 2 \ 2 & 2 & 1\end{array}ight]$ and $I$ be the identity matrix of order 3 . Then $M^2-4 M=$

Aicharya · Accepted Answer

No solution. Refer to answer key.

Let $M=\left[\begin{array}{lll}1 & 2 & 2 \\ 2 & 1 & 2 \\ 2 & 2 & 1\end{array}\right]$ and $I$ be the…