# Example 20 - Chapter 4 Class 12 Determinants

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

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Example 20 You are here

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Chapter 4 Class 12 Determinants

Serial order wise

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.