Given$\mathbf{R}=\left(\begin{array}{cc}1 & -4 \ 1 & 5\end{array}\right)$ And$\vec{u}=(1,-4)$ , Does$\mathbf{R} \vec{u}=(17,-19)$

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The Answer of Given$\mathbf{R}=\left(\begin{array}{cc}1 & -4 \ 1 & 5\end{array}\right)$ And$\vec{u}=(1,-4)$ , Does$\mathbf{R} \vec{u}=(17,-19)$

Given $\mathbf{R}=\left(\begin{array}{cc}1 & -4 \\ 1 & 5\end{array}\right)$ And $\vec{u}=(1,-4)$ , Does $\mathbf{R} \vec{u}=(17,-19)$