Question

What is a second-order determinant?

Answer 1

Second-order determinant:

• The determinant of the $2\times 2$ matrix is called the second-order determinant.
• The number of rows of second-order determinants is $2$.
• The number of columns of second-order determinants is $2$.
• For any $2\times 2$ matrix $A=\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]$
• The value second-order determinant is $\left|A\right|=ad-bc$.