Find the adjoint of the matrix $A .$ Then use the adjoint to find the inverse of $A$ (if possible). $$A=\left[\begin{array}{rrr} 1 & 2 & 3 \\ 0 & 1 & -1 \\ 2 & 2 & 2 \end{array}\right]$$
Added by Daniela B.
Step 1
The cofactor of a matrix is obtained by calculating the determinant of sub-matrices. For the given matrix A, the cofactor matrix is: Cof(A) = [[(1*-1) - (2*2), (0*-1) - (2*3), (0*2) - (1*2)], [(2*-1) - (1*2), (1*-1) - (2*2), (1*2) - (0*2)], [(2*1) - Show more…
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