" 4.If "A=([1,2,2],[2,1,2],[2,2,1])," prove that "A^(2)-4A-5I=0." 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=[[1,2,2],[2,1,2],[2,2,1]] , verify that : A^2-4A-5I=O

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

If A=|(1,2,2),(2,1,2),(2,2,1)|, verifty that A^2-4A-5I-5I=0

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

If A=[(3,2),(2,1)] verify that A^2-4A-I=0 . Hence find A^(-1)

For the matrix A=[{:(1,2,2),(2,1,2),(2,2,1):}] . Show that A^2-4A-5I=0 Hence find A^(-1)

Show that the matrix A=[[1,2,2],[2,1,2],[2,2,1]] satisfies the equation A^2-4A-5I_3=0 and hence find A^(-1)

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

If A=[3112], show that A^(2)-5A+7I=0 Hence find A^(-1) .