$\"\"$

For subtracting matrices, their dimension should be equal.

First write the dimension of the matrix.

The dimensions of matrix are $\"\"$ .

The operation is possible. $\"\"$

Multiply the matrix by 8.

$\"\"$

$\"\"$ (Multiply each element by 8)

$\"\"$ (Simplify) $\"\"$

Multiply the matrix by 2.

$\"\"$

$\"\"$ (Multiply each element by 2)

$\"\"$ (Simplify) $\"\"$

Perform the operation

$\"\"$

$\"\"$ (Subtract corresponding elements)

$\"\"$ (Simplify) $\"\"$

The value is $\"\"$ .