Question 480501
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
{{{(matrix(2,2,-3,4,-8,-7))}}} 
{{{matrix(2,2,a[1],b[1],a[2],b[2])}}} = {{{a[1]b[2] - b[1]a[2]}}} = -3*-7 - (4*-8)= 53