Given matrices are
.
=
(Product of two same signs is positive sign)
= 
=
(Multiply:
)
If two matrices have the same dimensions, they can be subtracted together. You subtract matrices by subtracting the corresponding elements of the matrices.
\ =
(Subtraction of two matrices)
=
(Product of two same signs is positive sign)
=
(Add:
)
=
(Subtract:
)
The value of
is
.