Use the following matrices, evaluate , if possible ...

Use the following matrices, evaluate , if possible
 

E=[-4 1
-2 2]
 

F=[1 0
4 -3
-2 6
-1 5]
 

G=[-4 0 3 5
1 -2 0 0]
 

H=[1 -2 -1 3
2 0 4 -1
3 5 -2 2
1 -1 0 0]
 

1. EG
2. HF
3. FG
4. E^2