Question

20 POINTS PLZ HELP

Select the correct answer from the drop-down menu.


The order of matrix A + B is __.

Answer 1

last one 4 x 1

Explanation:

Order of the matrices must be the same in order to add them up

Adding matrices mean adding corresponding elements together

Order of matrix is 4 rows and 1 column

Answer 2

4 x 1 ( 4 rows and one column)

Explanation:

Recall the definition for order of a matrix: The number of rows times the number of columns.

So, in this case, we are adding matrix A which is 4 rows and 1 column to matrix B which is also of 4 rows and one column, obtaining a third matrix that has also 4 rows and one column:

`\left[\begin{array}{cccc}-9\\0\\3\\-1\end{array}\right] +\left[\begin{array}{cccc}0\\4\\-6\\2\end{array}\right] =\left[\begin{array}{cccc}-9\\4\\-3\\1\end{array}\right]`

The resultant A + B is also of 4 rows and one column