If `A=[[1,-1],[2,-1]]`, then `A^2-4A+2I=?`

If A=[[1,10,2]], then A^(4)-2^(4)(A-I)=

If A=[[4,2-1,1]] then (A-21)(A-3I)=

Let A=[[2,3],[-1,2]] .Then A^(2)-4A+7I =

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

Let A= [[1,0,2],[2,0,1],[1,1,2]] then det((A-I)^(3)-4A) is

If A=[{:(1,2),(4,1):}] , then find A^(2)+2A+7I .

If A=[{:(2,-1),(-1,2):}] , verify A^(2)-4A+3I=0 , where I=[{:(1,0),(0,1):}] and O=[{:(0,0),(0,0):}] . Hence find A^(-1) .

If A=[[2,-1, 1],[-1 ,2,-1],[ 1, 1, 2]] .Verify that A^3-6A^2+9A-4I=0 and hence find A^(-1) .