Chapter 11.4, Problem 20AYU

In Problems 9-26, use the following matrices. Determine whether the given expression is defined. If it is defined, express the result as a single matrix; if it is not, say "not defined.�

$A=\left[\begin{array}{l}\begin{array}{ccc}0& 3& -5\end{array}\\ \begin{array}{ccc}1& 2& 6\end{array}\end{array}\right]$ $B=\left[\begin{array}{l}\begin{array}{ccc}4& 1& 0\end{array}\\ \begin{array}{ccc}-2& 3& -2\end{array}\end{array}\right]$ $C=\left[\begin{array}{c}4\\ 6\\ -2\end{array}\begin{array}{c}1\\ 2\\ 3\end{array}\right]$

$\left(A+B\right)C$