If `A=[[-1,2],[1,7]]` then find `A^(-1)`

If A=[[-1,0],[4,2],[0,-1]] then find (-7) A.

If A=[[3,2,1],[4,-1,2],[7,3,-3]] then find A^(-1) and hence solve the following system of equations : 3x+ 4y+7z= 14, 2x-y+ 3z= 4 and x+ 2y-32= 0.

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

If A=[[1,0-1,7]], find k such that A^(2)-8A+kI=O

If A= [[3,1] , [-1,2]] then show that A^2 - 5A+7I =0 Hence find A^(-1)

If A=[{:(2,-1),(1,3):}] , then show that A^(2)-5A+7I_(2)=O , hence find A^(-1) .

If A=[2-1 3 1] and B=[1 4 7 2], find 3A-2Bdot

If A=[(2,1,3),(4,-1,0),(-7,2,1)] , find A^(-1) and hence solve the following system of equations: 2x+y+3z=3 4x-y=3 -7x+2y+z=2

If A=[{:(1,0),(-1,7):}]" and "B=[{:(0,4),(-1,7):}] , find (3A^(2)-2B+I).

If A=[{:(3,1),(-1,2):}] , show that A^(2)-5A+7I=O . Hence, find A^(-1) .