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प्रश्न
If A = `[(0, -1, 2),(4, 3, -4)]` and B = `[(4, 0),(1, 3),(2, 6)]`, then verify that: (A′)′ = (AB)' = B'A'
उत्तर
Given that: A = `[(0, -1, 2),(4, 3, -4)]`, B = `[(4, 0),(1, 3),(2, 6)]`
L.H.S. AB = `[(0,-1, 2),(4, 3, -4)]_(2 xx 3) [(4, 0),(1, 3),(2, 6)]_(3 xx 2)`
= `[(0 - 1+ 4, 0 - 3 + 12),(16 + 3 - 8, 0 + 9 - 24)]_(2 xx 2)`
= `[(3, 9),(11, -15)]_(2 xx 2)`
(AB)' = `[(3, 11),(9, -15)]_(2 xx 2)`
R.H.S. B' = `[(4, 0),(1, 3),(2, 6)]^'`
= `[(4, 1, 2),(0, 3, 6)]`
A' = `[(0, -1, 2),(4, 3, -4)]^'`
= `[(0, 4),(-1, 3),(2, -4)]`
B'A' = `[(4, 1, 2),(0, 3, 6)]_(2 xx 3) [(0, 4),(-1, 3),(2, -4)]_(3 xx 2)`
= `[(0 - 1 + 4, 16 + 3 - 8),(0 - 3 + 12, 0 + 9 - 24)]_(2 xx 2)`
= `[(3, 11),(9, -15)]_(2 xx 2)`
L.H.S. = R.H.S.
Hence, (AB)' = B'A' is verified.
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