Trouble with Inverse Matrices - Can You Help?

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    Inverse Matrices
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SUMMARY

The discussion centers on the challenges faced in calculating the inverse of a 5x5 matrix and the subsequent multiplication with an identity matrix. The user provided their calculated inverse matrix and attempted to pre-multiply it with another matrix but encountered confusion regarding the results. Key insights include the necessity of performing row operations to achieve the identity matrix format and the suggestion to utilize a semi-identity matrix for simplification. The conversation emphasizes the importance of clarity in matrix operations and calculations.

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Homework Statement


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Homework Equations


I think it may have to do with inverse matrices or multiplication using the identity matrix

The Attempt at a Solution



I got the inverse of...

1,-2, 2, 2,-3
3,-5, 6, 2,-4
2,-2, 5,-4, 4
1,-3, 1, 7,-8
3,-4, 7, 0, 2

as...

-6,-14,25,20,-7
2,-13,19,14,-5
4, -2, 1, 0, 0
0, -1, 1, 1, 0
-1, 2 ,-3,-2, 1

and I premultiplied that to...

87, 57, 10,117,-101
208,232,133,330,-146
83,297,235,229, 116
154,-58,-97,112,-245
240,382,278,370, 092

But nothing really seems to make sense. Thanks if you can help!
 
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It looks to me like it's one big giant matrix and you'd have to do the row operations to get the first 5 columns in the identity format and see what that does to the last 5 columns.
Are you looking for the norm of columns 6-10? The question isn't entirely clear to me.
 
Last edited:
Yes, you have to do raw, direct calculations. But the semi-identity matrix will make it easier
 

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