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October 21, 2025, 08:42:02 pm
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Author Topic: Find all 2x2 matrices such that A^-1 = A  (Read 1248 times)  Share 

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#1procrastinator

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Find all 2x2 matrices such that A^-1 = A
« on: January 23, 2012, 11:52:39 am »
0
Using







I got the following:



But the answers also have this:



If you can write c as (1-a^2)/b, couldn't you do the same with b?
« Last Edit: February 10, 2012, 04:31:36 pm by #1procrastinator »
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