Evaluate the following :
\[
\left[\begin{array}{l}
4 \\
5
\end{arra...
Evaluate the following :
\[
\left[\begin{array}{l}
4 \\
5
\end{array}\right]\left[\begin{array}{ll}
7 & 9
\end{array}\right]+\left[\begin{array}{rr}
4 & 0 \\
0 & -5
\end{array}\right]
\]
(w)
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