Question 479115
{{{5A=5*(matrix(2,1,1,5))=(matrix(2,1,1*5,5*5))=(matrix(2,1,5,25))}}}
{{{A-B=(matrix(2,1,1,5))-(matrix(2,1,8,1))=(matrix(2,1,1-8,5-1))=(matrix(2,1,-7,4))}}}
{{{A*B}}} and {{{B*A}}} are impossible because of the matrix sizes