Answer:
The sum (answer) is [-1, 2, 1, 9].
Explanation:
Here we're asked to sum up two matrices of the same dimensions (1 by 4).
The value in the first matrix, first column, is 1; that in the second matrix, first column, is -2. Combining 1 and -2, we get -1, which is the first column value in the answer matrix.
Continuing in the same manner: -4 + 6 = 2; 3 - 2 = 1; and 5 + 4 = 9.
The sum (answer) is [-1, 2, 1, 9].