Question: Derive the adjoint of the 2 2 matrices and verify the results in (5.13), (5.14) and (5.15). Data from (5.13), (5.14) and (5.15).

Derive the adjoint of the 2 × 2 matrices

A 1 3 28 and B- 27 -3 -4

and verify the results in (5.13), (5.14) and (5.15).

Data from (5.13), (5.14) and (5.15).

A(adj A) = |A| 0 0 0 |A| 0 0|=|A|I 0 |A| (5.13)

ladj A| = |A1"-1 (5.14)

adj(AB) = (adj B)(adj A) (5.15)

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