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Algebra
Matrix invertible
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Manu
Average Member
Australia
9 Posts
Posted  04/10/2012 : 10:40:24
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.
the_hill1962
Advanced Member
USA
1469 Posts
Posted  04/10/2012 : 11:50:02
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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