DeterminantHard
Question
If A = 
, A-1 = 
, then
, A-1 = , thenOptions
A.a = 1, c = - 1
B.a = 2, c = - 1/2
C.a = - 1, c = 1
D.a = 1/2, c = 1/2
Solution
A = 
A-1 = 
AA-1 = I
⇒
∴ 2c + 2 = 0, 8 – 8a = 0
c = - 1, a = 1
A-1 = AA-1 = I
⇒
∴ 2c + 2 = 0, 8 – 8a = 0
c = - 1, a = 1
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