정답
$\det = ad - bc$.
해설
If the determinant equals zero ($ad - bc = 0$), the matrix has no inverse and the corresponding linear system has no unique solution.
홈 / 라이브러리 / ACT Mastery: English, Math, Reading & Science / AI 플래시카드
How is the determinant of a $2 \times 2$ matrix $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ calculated?
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