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What is the sum?

[tex]\[
\left[\begin{array}{ccc}
2 & -3 & 1 \\
-2 & 0 & 3 \\
0 & 5 & -1
\end{array}\right]+\left[\begin{array}{cc}
-2 & 0 \\
3 & 1 \\
-4 & 4
\end{array}\right]
\][/tex]

A. [tex]\(\left[\begin{array}{cc}0 & -3 \\ 1 & 1 \\ -4 & 9\end{array}\right]\)[/tex]

B. [tex]\(\left[\begin{array}{ccc}0 & 0 & -3 \\ -3 & 1 & 9\end{array}\right]\)[/tex]

C. [tex]\(\left[\begin{array}{ccc}0 & -3 & 1 \\ 1 & 1 & 3 \\ -4 & 9 & -1\end{array}\right]\)[/tex]

D. These two matrices cannot be added.


Sagot :

To determine the sum of the given matrices:
[tex]\[ \left[\begin{array}{ccc}2 & -3 & 1 \\ -2 & 0 & 3 \\ 0 & 5 & -1\end{array}\right] \][/tex]
and
[tex]\[ \left[\begin{array}{cc}-2 & 0 \\ 3 & 1 \\ -4 & 4\end{array}\right], \][/tex]

we first need to verify if matrix addition is possible. Matrix addition is defined only for matrices of the same dimension.

1. Examining the dimensions of the matrices:
- The first matrix has dimensions [tex]\(3 \times 3\)[/tex] because it has 3 rows and 3 columns.
- The second matrix has dimensions [tex]\(3 \times 2\)[/tex] because it has 3 rows and 2 columns.

2. Compare the dimensions:
- The first matrix is [tex]\(3 \times 3\)[/tex].
- The second matrix is [tex]\(3 \times 2\)[/tex].

Since the dimensions of the two matrices are different, they cannot be added together.

Therefore, the correct answer is:
D. These two matrices cannot be added.