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  • A=[(1, 2,1) (2, 3,1) (1, 1,5) ] proof (A^-1) ^-1=A

A=[(1, 2,1) (2, 3,1) (1, 1,5) ] proof (A^-1) ^-1=A

Answers (1)

best_answer

A=\left[\begin{array}{lll} 1 & 2 & 1 \\ 2 & 3 & 1 \\ 1 & 1 & 5 \end{array}\right]

Matrix A is invertible because its determinant is not equal to 0.

Therefore, 

(A-1)-1=A

Posted by

Divya Sharma

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