\(\begin{pmatrix} 2 & 0 & 1 \\ 3 & 2 & 4 \\ 1 & 4 & 1 \end{pmatrix}\) = 2\(\begin{pmatrix} 2& 4 \\ 4 & 1 \end{pmatrix}\) - 0\(\begin{pmatrix} 3 & 4 \\ 1 & 1 \end{pmatrix}\) + 1\(\begin{pmatrix} 3 & 2 \\ 1 & 4 \end{pmatrix}\) = 2(2 - 16) - 0 + 1(12 - 2) = 2(-14) + 1(10) = - 28 + 10 = - 18.