Find 3BA 6CD if possible A 3 2 5 0 6 3 B 3 1 2 6 C 1 0 3

Find (-3)BA + (6)CD, if possible. A = [3 -2 5 0 6 -3] B = [-3 1 2 6] C = [-1 0 3 6 -5 1 -3 2 4] D = [3 -5 0 -1 1 5] Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. (-3)BA + (6)CD = B. The answer is not defined.

Solution

CD=(3*3)*(3*2)=3*2

BA=(2*2)*(2*3)=2*3

When we add -3BA+6CD, we should follow matrix order...

A 3*2 order matrix cannot be added to a 2*3 matrix..hence the answer is not defined...option (B)