If $\mathrm{\Delta }\left(\mathrm{x}\right)=\left|\begin{array}{ccc}0& 2\mathrm{x}-2& 2\mathrm{x}+8\\ \mathrm{x}-1& 4& {\mathrm{x}}^2+7\\ 0& 0& \mathrm{x}+4\end{array}\right|\text{ and }\mathrm{f}\left(\mathrm{x}\right)=\sum _{\mathrm{j}=1}^3 \sum _{\mathrm{i}=1}^3 {\mathrm{a}}_{\mathrm{ij}}{\mathrm{c}}_{\mathrm{ij}}$where a_ij is the element of i^th row and j^th
column in $\mathrm{\Delta }\left(\mathrm{x}\right)\text{ and }{\mathrm{c}}_{\mathrm{ij}}$is the cofactor of ${\mathrm{a}}_{\mathrm{ij}}$for all i,j then greatest value of f(x), for $\mathrm{x}\in [-3,18]$ is