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Byju's Answer
Standard XII
Mathematics
Diagonal Matrix
If A is a dia...
Question
If A is a diagonal matrix diag
(
d
1
,
d
2
,
.
.
.
.
.
.
d
n
)
then
A
n
,
n
ϵ
R
i
s
d
i
a
g
(
d
n
1
,
d
n
2
.
.
.
.
.
d
n
n
)
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Solution
Let
A
=
⎡
⎢
⎣
d
1
0
0
0
d
2
0
0
0
d
3
⎤
⎥
⎦
A
2
=
A
⋅
A
⎡
⎢ ⎢
⎣
d
2
1
0
0
0
d
2
2
0
0
0
d
2
3
⎤
⎥ ⎥
⎦
by actual multiplication
similarly
A
3
=
A
⋅
A
2
⎡
⎢ ⎢
⎣
d
3
1
0
0
0
d
3
2
0
0
0
d
3
3
⎤
⎥ ⎥
⎦
The same procedure be followed for natural of n th term
similarly
A
n
=
⎡
⎢ ⎢
⎣
d
n
1
0
0
0
d
n
2
0
0
0
d
n
3
⎤
⎥ ⎥
⎦
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Q.
Assertion :If
D
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