\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
For \( \mathbf{A}=\begin{pmatrix} 5 & -1 \\ 2 & 8 \end{pmatrix}\) and \(\mathbf{B}=\begin{pmatrix} -3 & 1 \\ 4 & -2 \end{pmatrix}\), find \(2(\mathbf{A}+\mathbf{B})\).
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