Can someone pls answer this?
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Step-by-step explanation:
A
2
=AA=
⎣
⎢
⎢
⎡
1
0
2
0
2
0
2
1
3
⎦
⎥
⎥
⎤
⎣
⎢
⎢
⎡
1
0
2
0
2
0
2
1
3
⎦
⎥
⎥
⎤
=
⎣
⎢
⎢
⎡
5
2
8
0
4
0
8
5
13
⎦
⎥
⎥
⎤
A
3
=AA
2
=
⎣
⎢
⎢
⎡
1
0
2
0
2
0
2
1
3
⎦
⎥
⎥
⎤
⎣
⎢
⎢
⎡
5
2
8
0
4
0
8
5
13
⎦
⎥
⎥
⎤
=
⎣
⎢
⎢
⎡
21
12
34
0
8
0
34
23
55
⎦
⎥
⎥
⎤
A
3
−6A
2
+7A+21=
⎣
⎢
⎢
⎡
21
12
34
0
8
0
34
23
55
⎦
⎥
⎥
⎤
−
⎣
⎢
⎢
⎡
30
12
48
0
24
0
48
30
78
⎦
⎥
⎥
⎤
+
⎣
⎢
⎢
⎡
7
0
14
0
14
0
14
7
21
⎦
⎥
⎥
⎤
+
⎣
⎢
⎢
⎡
2
0
0
0
2
0
0
0
2
⎦
⎥
⎥
⎤
=
⎣
⎢
⎢
⎡
0
0
0
0
0
0
0
0
0
⎦
⎥
⎥
⎤
=0
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