The Determinant of a Matrix
A single number that captures important information about a square matrix.
Determinant of a 2x2 Matrix
For $A = \begin{pmatrix} a & b \\ c & d \end{pmatrix}$:
$$|A| = ad - bc$$Determinant of a 3x3 Matrix
Calculated by expansion along any row or column, using cofactors.
Lesson 8 of 32