# Example 23 - Chapter 4 Class 12 Determinants

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Example 23(Method 1) Find adj A for A = 2314 adj A = A11A21A12A22 Step1: Calculate minors M11 = 2314 = 4 M12 = 2314 = 1 M21 = 2314 = 3 M22 = 2314 = 2 Step2: Calculate cofactors A11 = ( −1)1 + 1 × 4 = (-1)2 × 4 = 1 × 4 = 4 A12 = ( −1)1+2 M12 = ( −1)3 × (1) = ( −1) (1) = −1 A21 = ( −1)2+1 M21 = ( −1)3 (3) = ( −1) (3) = −3 A22 = ( −1)2+2 . M22 = ( −1)4 . 2 = 2 Step 3: Calculate adjoint adj A = A11A21A12A22 = 4−3−12 Example 23 (Method 2) Find adj A for A = 2314 A = 2314 adj A = 2314 = 4−3−12

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Example 11

Example 12

Example 13

Example 14 Important

Example 15 Important

Example 16 Important

Example 17

Example 18 Important

Example 19

Example 20

Example 21

Example 22

Example 23 You are here

Example 24 Important

Example 25

Example 26 Important

Example 27

Example 28

Example 29

Example 30

Example 31

Example 32 Important

Example 33

Example 34 Important

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.