Question

If A = `[(0, -1, 2),(4, 3, -4)]` and B = `[(4, 0),(1, 3),(2, 6)]`, then verify that: (A′)′ = A

Answer 1

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