Determinants and Cramer's Rule
1 Evaluate a Second-Order Determinant
-$\left| \begin{array} { r r } 1 & - 2 \ 2 & 3 \end{array} \right|$
A) $ 7$
B) $- 1$
C) $- 7$
D) $- 8$

Question

Quizplus · Accepted Answer

The determinant of a 2x2 matrix $\left| \begin{array} { r r } a & b \ c & d \end{array} \right|$ is calculated as $ad - bc$. For this matrix, it is $1*3 - (-2)*2 = 3 + 4 = 7$.

Determinants and Cramer's Rule 1 Evaluate a Second-Order Determinant - ∣1−223∣\left| \begin{array} { r r } 1 & - 2 \\ 2 & 3 \end{array} \right|​12​−23​​

Determinants and Cramer's Rule
1 Evaluate a Second-Order Determinant
- $\left| \begin{array} { r r } 1 & - 2 \\ 2 & 3 \end{array} \right|$