if A=
[4 3
2 5] find A²-9A Matrix
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Answer:
A=[4 3
2 5]
A²=[16 9
4 25]
9A=36 27
18 45]
A²-9A
=[16 9
4 25]-[36 27
18 45]
= [-20 -18
-14 -20]
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