is there a 2x2 matrix A so A2 = -I?  TOPIC_SOLVED

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is there a 2x2 matrix A so A2 = -I?

Postby king&i on Wed Sep 09, 2009 7:22 pm

is there a 2x2 matrix A so A2 = -I?
(I is ident matrix)
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Postby stapel_eliz on Wed Sep 09, 2009 9:20 pm

Hint: Try a 2-by-2 matrix with zeroes on the diagonal:

. . . . .

See where this leads.... :wink:
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Re: is there a 2x2 matrix A so A2 = -I?  TOPIC_SOLVED

Postby nona.m.nona on Thu Sep 17, 2009 6:42 pm

In case you're still working on this:




Now solve. There is more than one solution.
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