Prove Theorem: Let A, B and C be m x n matrices m and let s and t be anyscalars. Than: A + B = B + A Let A, B and C be m x n matrices m and let s and t be anyscalars. Than: A + B = B + A Solution Let A= (aij)mxn and B=(bij)mxn A+B =(aij)mxn +(bij)mxn = (aij+bij)mxn =(bij+aij)mxn = ( bij)mxn+( aij)mxn =B+A =B+A.