Question 976520
I'll assume they're 2x2 matrices,
{{{(matrix(2,2,3,-1,6,0))*(matrix(2,2,0,-1,3,6))=(matrix(2,2,3*0+(-1)(3),3*(-1)+(-1)6,6*0+0*3,6(-1)+0(6)))}}}
{{{(matrix(2,2,3,-1,6,0))*(matrix(2,2,0,-1,3,6))=(matrix(2,2,-3,-9,0,-6))}}}