Mathematics Matrices 1 Mark
Appeared in: 2026 (3 sets)
If $\begin{vmatrix} -1 & -2 & 5 \\ -2 & a & -1 \\ 0 & 4 & 2a \end{vmatrix} = -86$, then the sum of all possible values of $a$ is (A) $4$ (B) $5$ (C) $-4$ (D) $9$