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Question
If A = `[(0, -1, 2),(4, 3, -4)]` and B = `[(4, 0),(1, 3),(2, 6)]`, then verify that: (A′)′ = A
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Solution
Given that: A = `[(0, -1, 2),(4, 3, -4)]`, B = `[(4, 0),(1, 3),(2, 6)]`
A' = `[(0, -1, 2),(4, 3, -4)]_(2 xx 3)^'`
= `[(0, 4),(-1, 3),(2, -4)]_(3 xx 2)`
(A')' = `[(0, 4),(-1, 3),(2, -4)]_(3 xx 2)^'`
= `[(0, -1, 2),(4, 3, -4)]_(2 xx 3)`
= A
Hence, (A')' = A
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