Get live Maths 1-on-1 Classs - Class 6 to 12
Examples
Example 2
Example 3
Example 4
Example 5 Important
Example 6 Deleted for CBSE Board 2023 Exams
Example 7 Deleted for CBSE Board 2023 Exams
Example 8 Deleted for CBSE Board 2023 Exams
Example 9 Important Deleted for CBSE Board 2023 Exams
Example 10 Important Deleted for CBSE Board 2023 Exams
Example 11 Deleted for CBSE Board 2023 Exams
Example 12 Deleted for CBSE Board 2023 Exams
Example 13 Deleted for CBSE Board 2023 Exams
Example 14 Important Deleted for CBSE Board 2023 Exams
Example 15 Important Deleted for CBSE Board 2023 Exams
Example 16 Important Deleted for CBSE Board 2023 Exams
Example 17
Example 18 Important
Example 19
Example 20
Example 21 You are here
Example 22 Important
Example 23
Example 24 Important
Example 25
Example 26 Important
Example 27
Example 28 Important
Example 29
Example 30
Example 31 Important Deleted for CBSE Board 2023 Exams
Example 32 Important Deleted for CBSE Board 2023 Exams
Example 33 Important
Example 34 Important Deleted for CBSE Board 2023 Exams
Last updated at March 16, 2023 by Teachoo
Example 21 Find minors and cofactors of the elements a11, a21 in the determinant ∆ = a11a12a13a21a22a23a31a32a33 Minor of a11 = M11 = a11a12a13a21a22a23a31a32a33 = a22a23a32a33 = a22 a33 – a23 a32 Minor of a21 = M21 = a11a12a13a21a22a23a31a32a33 = a12a13a32a33 = a12 a33 – a32 a13 Cofactor of a11 = A11 = ( – 1)1+1 . M11 = ( –1)2 . (a22 a33 – a32 a23) = a22 a33 – a32 a23 Cofactor of a21 = A21 = ( – 1)2+1 . M21= ( – 1)3 . (a12 a33 – a32 a13) = ( – 1) . (a12 a33 – a32 a13) = a32 a13 – a12 a33