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i got this question for hw and after a few hours of head scratching, i still haven't figure it out....

the question is, prove that the set of all 2x2 matrices with determinant zero, is not a subspace of M2x2 (<-- M2x2 means just a notation for 2x2 matrices).

someone please give me some hints...

thanks!

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# Homework Help: Linear algebra hw question

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