Consider $B=\left(\begin{array}{lll}3 & 0 & 0 \ 0 & 1 & 0 \ 0 & 0 & 4\end{array}\right)$.
(a) Is $B$ a square matrix?
(b) Is $B$ a diagonal matrix?
(c) Is $B$ a scalar matrix?

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The Answer of Consider $B=\left(\begin{array}{lll}3 & 0 & 0 \ 0 & 1 & 0 \ 0 & 0 & 4\end{array}\right)$.
(a) Is $B$ a square matrix?
(b) Is $B$ a diagonal matrix?
(c) Is $B$ a scalar matrix?

Consider B=(300010004)B=\left(\begin{array}{lll}3 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 4\end{array}\right)B=​300​010​004​​

Consider $B=\left(\begin{array}{lll}3 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 4\end{array}\right)$