Answer
[-12 ... 7]
[4 .... 6]
Work Step by Step
You have two matrices:
[-5 ... 1]
[0 .... 8]
And...
[7... -6]
[-4 .... 2]
Subtract the corresponding elements because the two matrices have the same size:
[-5-7 ... 1-(-6)]
[0-(-4) .... 8-2]
New matrix:
[-12 ... 7]
[4 ..... 6]