Question

if $e = \

$$\begin{bmatrix} 3 & 9 & -3 \\end{bmatrix}$$

$ and $f = \

$$\begin{bmatrix} 9 & 2 \\\\ -3 & -2 \\end{bmatrix}$$

$, what is $ef$? if the matrix exists, select its size before entering your answer. if the matrix does not exist, select undefined. $ef = \

$$\begin{bmatrix} \\square \\end{bmatrix}$$

$

Explanation:

Step1: Check matrix multiplication validity

Matrix $E$ is $1 \times 3$, matrix $F$ is $2 \times 2$. For matrix multiplication $EF$, the number of columns in $E$ (3) must equal the number of rows in $F$ (2). Since $3
eq 2$, the product is undefined.

Answer:

undefined