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$[\begin{array}{c} 1 & 0 & 0 \\ 0 & r - 4 & 4 \\ 0 & s - 5 & r + 4 \\ 0 & 0 & 5 \end{array}]$

خطوة 1

A matrix is a rectangular arrangement or array of elements. The dimensions of a matrix, $m \times n$ , identify how many rows and columns a matrix has. $m$ represents the number of rows and $n$ represents the number of columns. Assuming that the matrix name is $A$ , the matrix dimensions are written as $A_{m \times n}$ .

خطوة 2

The number of rows is $4$ .

$m = 4$

خطوة 3

The number of columns is $3$ .

$n = 3$

خطوة 4

The given matrix has dimensions $m \times n = 4 \times 3$ .

$A_{m \times n} = A_{4 \times 3}$