DeterminantHard

Question

If A = , A-1 = , then

Options

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

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