Question

Select the correct answer. If A = [5 -8 3 0] -and B = [2 -9 1 0] , which matrix is the result of 2A - 38?
A [4 11 3 0] B. (4 38 9 0] C. [4 11 9 0] D. [1 -18 1 0]​

Answer 1

2A - 3B =
2 [5, -8, 3, 0] - 3 [2, -9, 1, 0] =
[10, -16, 6, 0] + [-6, 27, -3, 0] =
[10 - 6, -16 + 27, 6 - 3, 0 + 0] =
[4, 11, 3, 0] = A

I love linear algebra!

Answer 2

Answer: A

Step-by-step explanation: I got this right on Edmentum.