Given the following matrices, find 3A - 2B. (Hint: find 3A and 2B first and then subtract.)
A= [1 3] B=[4 9] [ 5 -2 1] [-1 2 1
[ 5 2] [0 3] C= [ 0 -8 6] D= [6 -6 4
[-4 4 -4] [2 -8 3

Question

Given the following matrices, find 3A - 2B. (Hint: find 3A and 2B first and then subtract.)
A= [1  3]    B=[4  9]            [ 5 -2  1]           [-1  2  1
      [ 5 2]         [0  3]     C=  [ 0 -8  6]    D= [6  -6  4
                                            [-4  4  -4]           [2  -8 3

anonymous · Answer

3a is  found by multiplying by 3

3    9
15  6

2B is found by multiplying by 2

8   18
0     6

anonymous · Answer

Now subtract

3-8       9 -18
15 -0     6 - 6

or

-5      -9
15       0