## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$28$
The determinant for a 2 by 2 matrix can be computed as: $Determinant (D)= \begin{vmatrix} a & b \\ c & d \\ \end{vmatrix}=ad-bc$ Therefore, $D=(8)(2) -(4)(-3) \\=16+12 \\=28$