If `A=[[1,3],[2,7]]` then find `A^(-1)`

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={1,2,3}and B={3,5,7} , the find A oplusB .

If A=[[2,3],[4,7]] and B=[[1,3],[4,6]] find 3A-2B

If A=[[2,3],[4,7]] and B=[[1,3],[4,6]] find 3A-2B

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

if A=[{:(3,-2),(7,1):}]and B=[{:(2,3),(-1,4):}], then find (i) A+B (ii) A-2B

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

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

If z_1=7+3i and z_2=-7+3i then find the following: z_1z_2

If z_1=7+3i and z_2=-7+3i then find the following: barz_1barz_2