If A = [3-4-12], find matrix B such that BA = I,where I is unity matrix of order 2 - Mathematics | Shaalaa.com

For the matrix A=begin{bmatrix} 1 & 1 & 1 1 & 2 & -3 2 & -1 & 3 end{bmatrix}, show that { A }^{ 3 }-{ 6A }^{ 2 } 5A 11I=0. Hence { A }^{ -1 }