Question 84471
A = {{{(matrix(2,2,5,1,3,2))}}},  B = {{{(matrix(2,2,-1,3,4,1))}}}

A - 2B = {{{(matrix(2,2,5,1,3,2))}}} - 2{{{(matrix(2,2,-1,3,4,1))}}} =

{{{(matrix(2,2,5,1,3,2))}}} - {{{(matrix(2,2,-2,6,8,2))}}} =

{{{(matrix(2,2,(5-(-2)),(1-6),(3-8),(2-2)))}}} =

{{{(matrix(2,2,(5+2),(1-6),(3-8),(2-2)))}}} =

{{{(matrix(2,2,7,-5,-5,0))}}}