## Precalculus (6th Edition) Blitzer

The value of the second order determinant is $ad-bc$.
To evaluate a second-order determinant, we will find the difference of the product of the two diagonals. Example: $\text{For any determinant,}$ $\left| \begin{matrix} a & b \\ c & d \\ \end{matrix} \right|=ad-bc$