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Cofactors in systems of eqations?

 
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bfield02
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Joined: 12 Aug 2003
Posts: 25
PostPosted: Sun, 7 Sep 2003 14:02:49 UTC    Post subject: Cofactors in systems of eqations? Reply with quote
I seem to have a grasp on the determinates and just can't seem to figure out the cofactor mehtod.

For example find the cofactor for each element in the second row

2 -1 4
3 0 1
-2 1 4

How do you come up with the following 2x2 matixes with Mij total Confused
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Soroban
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Joined: 19 May 2003
Posts: 7246
Location: Lexington, MA
PostPosted: Sun, 7 Sep 2003 15:19:58 UTC    Post subject: Re: Cofactors in systems of eqations? Reply with quote
Hello, bfield02!

bfield02 wrote:
I seem to have a grasp on the determinates and just can't seem to figure out the cofactor mehtod.

For example: find the cofactor for each element in the second row

2 -1 4
3 0 1
-2 1 4


To find, for example, the cofactor of 3:
mentally cross out the row that "3" is in
and the column that "3" is in.
What remains is the cofactor of 3.

It looks like this:


The cofactor of 3 is:
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bfield02
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Joined: 12 Aug 2003
Posts: 25
PostPosted: Sun, 7 Sep 2003 18:08:51 UTC    Post subject: THanks for the help Reply with quote
was making it way harder than it had to be. Surprised
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