Show that a matrix ISNT invertible?

So matrix A is

1 2 1 0
3 1 2 3
2 5 0 1
2 -1 1 3

how will i go able showing that this matrix ISNT invertible?

Quote:

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Originally Posted by Brennox

So matrix A is

1 2 1 0
3 1 2 3
2 5 0 1
2 -1 1 3

how will i go able showing that this matrix ISNT invertible?

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A square matrix is only invertible if , so to show that this matrix is NOT invertible, evaluate and show that it equals 0.

double post

http://mathhelpforum.com/advanced-al...nvertible.html