|A| = 5(–1) + 4(1) = –1C11 = –1 C21 = 8 C31 = –12C12 = 0 C22 = 1 C32 = –2C13 = 1 C23 = –10 C33 = 15Hence, ORUsing, AA–1 = IA = IAHence,

Q. 25

Given, <img

Answer :

|A| = 5(–1) + 4(1) = –1

C₁₁ = –1 C₂₁ = 8 C₃₁ = –12

C₁₂ = 0 C₂₂ = 1 C₃₂ = –2

C₁₃ = 1 C₂₃ = –10 C₃₃ = 15

Hence,

Using, AA^–1 = I

A = IA

Hence,

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