mickeyandoswald6 mickeyandoswald6
  • 12-05-2020
  • Mathematics
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6What is the determinant of (image attached)

6What is the determinant of image attached class=

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LammettHash
LammettHash LammettHash
  • 12-05-2020

Using a cofactor/Laplace expansion along the third row:

[tex]\begin{vmatrix}-2&2&-5\\4&-1&-2\\1&3&-5\end{vmatrix}=1\begin{vmatrix}2&-5\\-1&-2\end{vmatrix}-3\begin{vmatrix}-2&-5\\4&-2\end{vmatrix}+(-5)\begin{vmatrix}-2&2\\4&-1\end{vmatrix}[/tex]

The determinant of a generic 2x2 matrix is

[tex]\begin{vmatrix}a&b\\c&d\end{vmatrix}=ad-bc[/tex]

So we get

[tex]\begin{vmatrix}-2&2&-5\\4&-1&-2\\1&3&-5\end{vmatrix}=1(-9)-3(24)+(-5)(-6)=\boxed{-51}[/tex]

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