Problem 1 :
Solution :
|A| = (1/9) [-8(16 + 56) - 1(16 - 7) + 4(-32 - 4)]
= (1/9)[-8(72) - 1(9) + 4(-36)]
= (1/9)[-576 - 9 - 144]
= (1/9)(-729)
= -81
(1) = (2)
Problem 2 :
Solution :
|A| = 24 - 20
|A| = 4
(1) = (2) = (3)
Problem 3 :
Solution :
(AB)-1 = (1/|AB|) adj AB
|AB| = -77 + 90
|AB| = 13
(AB) -1 = B-1 A-1
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