If `A=[1 2 2 2 1 2 2 2 1]` , find `A^(-1)` and prove that `A^2-4A-5I=O` .

If A=[122212221], find A^(-1) and prove that A^(2)-4A-5I=O

If A=[(1, 2 ,2 ),(2 ,1 ,2),( 2 ,2, 1)] , then prove that A^2-4A-5I=O .

Let A = ( ( 1 2 2) , (2 1 2), (2 2 1)) .Find A^-1 and hence show A^2-4A-5I=0 .

If A=[1 2 2 2 1 2 2 2 1] , then show that A^2-4A-5I=O ,w h e r eIa n d0 are the unit matrix and the null matrix of order 3, respectively. Use this result to find A^(-1)dot

If A=[[1,2,22,1,22,2,1]], then prove that A^(2)-4A-5I,=O

Show that the matrix A=[[1 ,2, 2],[ 2, 1, 2],[ 2, 2, 1]] satisfies the equation A^2-4A-5I_3=O and hence find A^(-1) .

If A =[[1,2,2],[2,1,2],[2,2,1]] then prove that A^2-4A-5I=0 .

If A=[ (3,-2),( 4 ,-2) ] and I=[(1,0),(0,1)] , then prove that A^2-A+2I=O .

If A=[{:(1,2,2),(2,1,2),(2,2,1):}] , prove that A^(2)-4A-5I=O and hence, obtain A^(-1) .