Question
Asked Nov 26, 2019
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Hi,

what is the fastest way to find the cofactor matrix for a 3x3 matrix?

The calculator allowed is Casio 991es plus.

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Expert Answer

Step 1

Let us suppose that the given matrix is A:

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а, а, аз А%3D| а, а, аз а, 32

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Step 2

 

Now find the matrix of miners, for this ignore the values on the current row and column and calculate the determinant...

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а,, а Ав а, а, Ав а, аз A1 а, а, аз а, а,з а, аз а,, а, Аз а, а, Ai а, аз а, а, а, аз, а, а, а, а, -& м- А, 11 а, ар A1 А, 33 12 а, 32 а, аз 21 а, аз. 22

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Math

Algebra