Answer
The expression: "$CD + B$" is undefined.
Work Step by Step
1. Check if the expression is defined
For a matrix multiplication ($CD$), the length of the row in the first matrix must be equal to the length of the column in the second one.
$C$ row length: $2$
$D$ column length: $2$
Therefore, the expression is defined and the multiplication is possible.
$C$ is a $3 \times 2$ matrix, and $D$ is a $2 \times 3$ one.
So, the resulting matrix is going to be a $3 \times 3$
For a matrix addition ($CD$ + $B$), the matrices must have the same dimensions:
$CD$ is $3 \times 3$ and $B$ is $2 \times 2$.
- The expression is undefined and cannot be evaluated:
