Question

Find the inverse of the matrix `A = [(1,2,-2),(-1,3,0),(0,-2,1)]`using elementary row transformations.

Answer 1

`A = [(1,2,-2),(-1,3,0),(0,-2,1)]`

= 1[3] - 2[-1] - 2[2]

`= 3 + 2 - 4 = 1 != 0 => A^(-1)` exist 

we know