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Mathematics
Mathematics
Problem
Let
A
A
A
be a
3
×
3
3 \times 3
3
×
3
matrix. Evaluate
(
I
3
+
A
)
I
3
−
A
I
3
(I_3 + A)I_3 - AI_3
(
I
3
+
A
)
I
3
−
A
I
3
. a)
O
3
O_3
O
3
b)
2
A
2A
2
A
c)
I
3
I_3
I
3
d)
I
3
+
A
I_3 + A
I
3
+
A
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