$\"\"$

Given matrices are $\"\"$ .

The above two matrices same dimensions, $\"\"$ and they can be together.

First apply scalar multiplication is done by multiplying each element of the second matrix by the scalar 4.

$\"\"$

The product of two different signs is negative and the product of two same signs is positive.

$\"\"$

Next add matrices by adding the corresponding elements of the matrices.

$\"\"$

The product of two different signs is negative and the product of two same signs is positive.

$\"\"$

The value of $\"\"$ is $\"\"$ .