Matrices: Evaluation of Determinant

Tried factorizing it, but didn't work.
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11 Replies
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@Apu
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Opt
Opt3w ago
Is it ABCD?
SirLancelotDuLac
SirLancelotDuLacOP3w ago
Yeah. How did you get that?
Opt
Opt3w ago
d was trivial, just multiply BC and everything cancels. a is also trivial options b and c, I sorta cheated
SirLancelotDuLac
SirLancelotDuLacOP3w ago
Ah, if d is correct then b and c must be correct. I see.
Opt
Opt3w ago
That's the correct logic I sorta did it illegally It's easier than you think to do this, because you only need to consider terms where the exponent is less than three
SirLancelotDuLac
SirLancelotDuLacOP3w ago
I see. So only -8I remains ig
Opt
Opt3w ago
Yup
SirLancelotDuLac
SirLancelotDuLacOP3w ago
Well, thanks a lot. +solved @Opt
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