Given the following matrices, find 3A - 2B. (Hint: find 3A and 2B first and then subtract.)

A = 1 3
5 2
B = 4 9
0 3
C = 5 -2 1
0 -8 6
-4 4 -4

D = -1 2 1
6 -6 4
2 -8 3

A. -5 -9
15 0
B. 3 9
15 6
C. 11 27
15 12
D. Not possible

Question

Given the following matrices, find 3A - 2B. (Hint: find 3A and 2B first and then subtract.) 

A = 1 3
       5 2     
B = 4 9 
       0 3
C =  5 -2  1
        0 -8  6
       -4  4  -4

D = -1 2 1
         6 -6 4
          2 -8 3

A.	-5 -9
         15 0
B. 3   9
    15 6
C. 11 27
    15 12	
D.	Not possible

anonymous · Answer

Its A. 
When you multiply a constant k to a matrix, you multiply all the corresponding numbers in the matrix by k. 
So 3A would be = 3  9
                           15 6
and 2b would be = 8 18
                              0 6

Now subtract it.  :)