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 Matrix invertible
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Manu
Average Member

Australia
9 Posts

Posted - 04/10/2012 :  10:40:24  Show Profile  Reply with Quote
Show that matrix A
1 2 1 0
3 1 2 3
2 5 0 1
2 -1 1 3
is not invertible


I took a
24

so (1 2 1)
3 (2 5 0)
(2 -1 1)
which gave me det A = -33
so not invertible.
Am I right. Any help would be good.
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the_hill1962
Advanced Member

USA
1468 Posts

Posted - 04/10/2012 :  11:50:02  Show Profile  Reply with Quote
You are correct, the matrix does not have an inverse.
However, I don't understand what you meant about "I took a 24".
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