$\"\"$

For adding 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 5.

$\"\"$

$\"\"$ (Multiply each element by 5)

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

Multiply the matrix by 3.

$\"\"$

$\"\"$ (Multiply each element by 3)

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

Add the matrices

$\"\"$

Add to each element.

$\"\"$

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

The value is $\"\"$ .