Answer:
A11 =
(?1)1+1 (?6) = ?6
A12 =
(?1)1+2 (?4) = 4
A21 =
(?1)2+1 3 = ?3
A22 =
(?1)2+2 2 = 2.
?
(1)
and (adj A)
?..
(2)
Also ?.
(3)
From (1), (2)
and (3), we get A (adj A)
= (adj A) A =
|A| I
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