Question

Show that the solution x=A^(-1)b is unique, that is, there cannot exist a different vector x] with Ax'=b

Answer 1

A any matrix linear compination ?

Answer 2

couse in 3×3 for A , A^-1 is not uniqe

Answer 3

anyway
x=A^-1 b
Ax=AA^-1 b
Ax=Ib
Ax=b