There are two values of $a$ which makes the determinant $\Delta=\begin{vmatrix}1 & -2 & 5\\2 & a & 1\\0 & 4 & 2a\end{vmatrix}= 86,$ then sum of these number is

Question

$\begin{array}{1 1} 4 \\ 5 \\ -4 \\ 9 \end{array}$