Calculate $| \mathbf { A } |$
-$$A = \left| \begin{array} { l l l }
1 & 2 & 3 \
2 & 5 & 5 \
1 & 2 & 3
\end{array} \right|$$
A)-20
B)0
C)1
D)74

Name: Calculate $| \mathbf { A } |$ -\[A = \left| \begin{array} { l l l } 1 & 2 & 3 \\ 2 & 5 & 5 \\ 1 & 2 & 3 \end{array} \right|\] A)-20 B)0 C)1 D)74
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Question

Calculate $| \mathbf { A } |$
-$$A = \left| \begin{array} { l l l } 
1 & 2 & 3 \
2 & 5 & 5 \
1 & 2 & 3
\end{array} \right|$$
A)-20
B)0
C)1
D)74

Quizplus · Accepted Answer

The determinant of matrix A is 0 because the first and third rows are identical, which means the matrix is not invertible and its determinant is zero.

Calculate ∣A∣| \mathbf { A } |∣A∣ - A=∣123255123∣A = \left| \begin{array} { l l l } 1 & 2 & 3 \\2 & 5 & 5 \\1 & 2 & 3\end{array} \right|A=​121​252​353​​

Calculate $| \mathbf { A } |$ - $A = \left| \begin{array} { l l l } 1 & 2 & 3 \\2 & 5 & 5 \\1 & 2 & 3\end{array} \right|$