Answer:
Try -4
Sorry if it's incorrect.
Explanation:
[3, -1]
The computation is performed element by element, as you appear to have figured.
2f -g = 2[4, 1] -[5, 3] = [2·4 -5, 2·1 -3] = [8-5, 2-3]
2f -g = [3, -1]
5.2m questions
6.8m answers