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Mathematics
Mathematics
Problem
11. If A is square matrix such that
A
2
=
A
\mathrm{A}^{2}=\mathrm{A}
A
2
=
A
, then
(
I
+
A
)
3
−
7
A
(\mathrm{I}+\mathrm{A})^{3}-7 \mathrm{~A}
(
I
+
A
)
3
−
7
A
is equal to (A) A (B)
I
−
A
\mathrm{I}-\mathrm{A}
I
−
A
(C) I (D) 3 A (A) A (B)
m
a
t
h
r
m
I
−
m
a
t
h
r
m
A
mathrm{I}- mathrm{A}
ma
t
h
r
m
I
−
ma
t
h
r
m
A
(C) I (D) 3 A
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