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If A = [(1, - 2, 3), (0, -1, 4), (-2, 2, 1)] then find (A')^–1.

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If A = [(1, - 2, 3), (0, -1, 4), (-2, 2, 1)]  then find (A')–1.

 

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det A = 1(–1 – 8) + 2(0 + 8) + 3(0 – 2)

= –9 + 16 – 6

= 1

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