Respuesta
$\det = ad - bc$.
Explicación
If the determinant equals zero ($ad - bc = 0$), the matrix has no inverse and the corresponding linear system has no unique solution.
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How is the determinant of a $2 \times 2$ matrix $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ calculated?
Flashcard de estudio del mazo ACT Mastery: English, Math, Reading & Science.