Vector: product of a vector by a matrix

Product of a vector by a matrix

$\begin{pmatrix}a & b\\\ c & d\end{pmatrix}$ $\begin{pmatrix}e \\\ f \end{pmatrix}$ = $\begin{pmatrix}ae+bf \\\ ce +df \end{pmatrix}$

Given:

$\overrightarrow{v}$

M

M$\overrightarrow{v}$ =

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