SOLUTION: Suppose A is a 2*2 matrix where the sum of each of the columns is equal to 0. Prove that A in not invertible.

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Question 298101: Suppose A is a 2*2 matrix where the sum of each of the columns is equal to 0. Prove that A in not invertible.
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
a b
-a -b


determinant is -ab+ab=0 ----> matrix is not invertible