If `A=[(1,0,0),(0,-1,0),(0,0,2)]` and `B=[(2,0,0),(0, 3,0),(0,0,-1)]` , find `A+B` , `3A+4B` .

If A={:[(3,2,7),(1,1,4),(-1,-1,0)]:},B={:[(1,0,3),(2,1,0),(0,-1,-3)]:}andC{:[(1,0,0),(0,1,0),(0,0,1)]:} , then find 2A+3B-7C.

If A=[(1,0),(0,3)] and B=[(2,0),(0,1)] then show AB =BA =[(2,0),(0,3)]

If A=[[1,0,0],[0,1,0],[a,b,-1]] , find A^2

The inverse of [(1,a,b),(0,x,0),(0,0,1)] is [(1,-a,-b),(0,1,0),(0,0,1)] |then x =