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 :
$\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
$\left[\begin{array}{ll}6 & 0 \\ 0 & 6\end{array}\right]$
As matrix A has all its non-diagonal elements zero and diagonal elements same. ∴ A is a scalar matrix.
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$\left|\begin{array}{ccc}2 & -5 & 7 \\ 5 & 2 & 1 \\ 9 & 0 & 2\end{array}\right|$
$\left[\begin{array}{ccc}10 & -15 & 27 \\ -15 & 0 & \sqrt{34} \\ 27 & \sqrt{34} & \frac{5}{3}\end{array}\right]$