Question

Find the inverse of this 3x3 matrix. [1 5 2]

[ 1 1 7]
[0 -3 7]

Answer 1

A

Explanation:

⎡−25 26 −33⎤

⎥ 4 −4 5 ⎥

⎥ 3 −3 4 ⎦

Answer 2

Lets say the 3x3 Matrix is

M = [1 5 2 ]
[1 1 7 ]
[0 -3 7 ]

We apply the Gauss-Jordan elimination method (Procedure and result shown in the image below)