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

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

Let A=[1 2 2 2 1 2 2 2 1] . Then A^2-4A-5I_3=O b. A^(-1)=1/5(A-4I_3) c. A^3 is not invertible d. A^2 is invertible

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):}| , then show that A^(2)-4A-5I_(3)=0 . Hemce find A^(-1) .

(i) if A=[{:(1,-1),(2,3):}], then show that A^(2)-4A+5I=O. (ii) if f(x)=x^(2)+3x-5and A=[{:(2,-1),(4,3):}], then find f(A).

if A=[[1,2,22,1,22,2,1]] then find the value of A^(2)-4A+5I_(3) then find the value of

If A^(3)=O , then prove that (I-A)^(-1) =I+A+A^(2) .