Question 1065020
{{{A=(matrix(2,2,3,-4,-2,5))}}}
{{{B=(matrix(2,3,5,-2,8,1,0,-3))}}}
{{{C=(matrix(3,3,7,-9,0,3,-5,1,-1,6,2))}}}
So,
{{{AB=(matrix(2,3,11,-6,36,-5,4,-31))}}}
{{{BC=(matrix(2,3,21,13,14,10,-27,-6))}}}
So then,
{{{AB+BC=(matrix(2,3,32,7,50,5,-23,-37))}}}