Question: Formula (4) is occasionally needed in theory. To understand it, apply it and check the result by GaussJordan: In Prob. 3 Data from Prob. 3

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

In Prob. 3

Data from Prob. 3

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

Formula (4) is occasionally needed in theory. To understand it, apply it 

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