Question
Classify the following matrices as a row, a column, a square, a diagonal, a scalar, a unit, an upper triangular, a lower triangular, a symmetric or a skew- symmetric matrix :
$\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
✓
Answer
Let $A=\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
As matrix A has all its non-diagonal elements zero and diagonal elements same. ∴ A is a scalar matrix.
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