Question: Formula (4) is occasionally needed in theory. To understand it, apply it and check the result by GaussJordan: In Prob. 6 Data from Prob. 6

Formula (4) is occasionally needed in theory. To understand it, apply it and check the result by Gauss€“Jordan:

In Prob. 6

Data from Prob. 6

Find the inverse by Gauss€“Jordan (or by (4*) if n = 2). Check by using (1).

-4 8. 13 3  

-4 8. 13 3

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