Each element in the result is the negative of the original, as seen below.

The negation of a matrix is formed by negating each element of the matrix:

-A= -1A

So, for example:

It will not surprise you that:

A+(-A)=0

(Notice that that last zero is a bold-faced zero, designating the zero matrix.)

Look at the above fact. Can you think of a way to define *matrix subtraction*?