Formula for the determinant of a 2-by-2 matrix.
Formula: For a $2 \times 2$ matrix:
$$\det\begin{pmatrix} a & b \\ c & d \end{pmatrix} = ad - bc$$
Now you are in the subtree of Container for Linear Algebra project.
Formula: For a $2 \times 2$ matrix:
$$\det\begin{pmatrix} a & b \\ c & d \end{pmatrix} = ad - bc$$