Need help : Rank of Determinant

Need help : Rank of Determinant

Postby Mahmoud Ibrahim » Sun Jul 01, 2018 4:47 am

Please , I need help for the attached question . Thanks

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Re: Need help : Rank of Determinant

Postby nathi123 » Sun Jul 01, 2018 3:54 pm

If rank of A is 2 , then the determinant of A must be equal to 0 ( det A = 0 ) Det A = 2.0.(-1) + 4.3.k+1.1.2 - 2.0.3 - 1.(-1).k-2.4.1=12k+2 - 8 +k =13k - 6
[tex]detA=0\Leftrightarrow k = \frac{6}{13}[/tex]

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Re: Need help : Rank of Determinant

Postby Mahmoud Ibrahim » Mon Jul 09, 2018 5:15 am

Thanks very much.

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