# DEPRECATED Zero and identity matrices

### Problem

Let A and B be 4, times, 4 matrices. Let I represent the 4, times, 4 identity matrix and O represent the 4, times, 4 zero matrix.
Fill in each blank with a matrix expression involving one or two matrices.
We know that
space, B, minus, B, equals
.
Therefore,
space, A, B, minus, A, B, equals
.
Do 7 problems