(* Linear Algebra: Theory and Applications *)
(* Ward Cheney & David Kincaid *)
(* JBPub.com (c) 2008  *)
(* File: exp3216.mat *)
(* Example 3.2.16      *)

MatrixForm[A = Table[Random[Real,{-5,5},15],{3},{3}]]
MatrixForm[B = Inverse[A]]
B.A