B=
-1 3
2 1
I=
1 0
0 1
C=2B+3I
2B=
-2 6
4 2
3I=
3 0
0 3
sumando
C=
1 6
4 5
finalmente
a) c11 =1
b) c21=4
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B=
-1 3
2 1
I=
1 0
0 1
C=2B+3I
2B=
-2 6
4 2
3I=
3 0
0 3
sumando
C=
1 6
4 5
finalmente
a) c11 =1
b) c21=4