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Question

If A=[2341], then adj(3A2+12A) is equal to 


A
[72846351]
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B
[51638472]
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C
[51846372]
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D
[72638451]
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Solution

The correct option is B [51638472]
We have, A=[2341]A2=A.A[2341] [2341]=[4+12638412+1]=[1691213]Now,3A2+12A=3[1691213]+12[2341]=[48273639]+[24364812]=[72638451]adj(3A2+12A)=[51638472]

Mathematics

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