Evaluate.
-$\left| \begin{array} { r r } 1 & - 1 \ 2 & 2 \end{array} \right|$
A) 4
B) $- 4$
C) $- 5$
D) 0

Name: Evaluate. -$\left| \begin{array} { r r } 1 & - 1 \\ 2 & 2 \end{array} \right|$ A) 4 B) $- 4$ C) $- 5$ D) 0
Brand: Quizplus
Rating: 4.9 (29 reviews)

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 $1*2 - (-1)*2 = 2 + 2 = 4$.

Evaluate - ∣1−122∣\left| \begin{array} { r r } 1 & - 1 \\ 2 & 2 \end{array} \right|​12​−12​​

Evaluate
- $\left| \begin{array} { r r } 1 & - 1 \\ 2 & 2 \end{array} \right|$