Question 93647
FOR PROBLEMS 18 - 20 USE THESE MATRICES: 
A = [2    1    7
     4    3    8
     6    5    9]




 B =  0
      2
      3

Find A2,1 
 
 ANS:   4    ( i.e the element in the second row first column)

If C = AxB, the order of C is:

Order of A = 3x3 matrix

Order of B = 3x1 matrix

Oder of  C = AxB = 3x1   (row of A x column of B )  
 
                                 (3x 1)
If C=AxB, find C2,1. 

 C=  AXB = [ 2x0+1x2+7x3
             4x0+3x2+8x3
             6x0+5x2+9x3]

         =  [0+2+21
             0+6+24
             0+10+27]
C=  AXB 
        =  [23
            30
            37]

C2,1 = 30  ( element of second row first column)

 
 
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