# Example 20 - Chapter 4 Class 12 Determinants (Term 1)

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Example 20 Find minors and cofactors of all the elements of the determinant 1 2 4 3 Minor of a11 = M11 = 1 2 4 3 = 3 Minor of a12 = M12 = 1 2 4 3 = 4 Minor of a21 = M21 = 1 2 4 3 = 2 Minor of a22 = M22 = 1 2 4 3 = 1 Cofactor of a11 = A11 = ( 1)1+1 M11 = ( 1)2 . 3 = 3 Cofactor of a12 = A12 = ( 1)1+2 M12 = ( 1)3 . 4 = ( 1) (4) = 4 Cofactor of a21 = A21 = ( 1)2+1 . M21 = ( 1)3 ( 2) = ( 1) ( 2) = 2 Cofactor of a22 = A22 = ( 1)2+2 . M22 = ( 1)4 . (1) = (1) (1) = 1

Examples

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Example 5 Important

Example 6 Deleted for CBSE Board 2022 Exams

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Example 9 Important Deleted for CBSE Board 2022 Exams

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Example 12 Deleted for CBSE Board 2022 Exams

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Example 20 You are here

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Example 30 Deleted for CBSE Board 2022 Exams

Example 31 Important Deleted for CBSE Board 2022 Exams

Example 32 Important Deleted for CBSE Board 2022 Exams

Example 33 Important

Example 34 Important Deleted for CBSE Board 2022 Exams

Chapter 4 Class 12 Determinants (Term 1)

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.