Ex 4.5, 1 - Chapter 4 Class 12 Determinants (Term 1)
Last updated at Dec. 8, 2016 by Teachoo
Transcript
Ex 4.5, 1 (Method 1) Find adjoint of each of the matrices. 1234 Let A = 1234 adj A = A11A21A12A22 Step1: Calculate minors M11 = 2234 = 4 M12 = 2234= 3 M21 = 1234 = 2 M22 = 1234 = 1 Step2: Calculate cofactors A11 = ( – 1)1+1 . M11 = ( – 1)2 4 = 4 A12 = ( – 1)1+2 . M12 = ( – 1)3 (3) = ( – 1) (3) = –3 A21 = ( – 1)2+1 . M21 = ( – 1)3 2 = ( – 1) (2) = –2 A22 = ( – 1)2+2 (1) = ( – 1)4 (1) = 1 Step 3: Calculate adjoint adj A = A11A12A21A22 = 4−2−31 Ex 4.5, 1 (Method 2) Find adjoint of each of the matrices. 1234 A = 1234 adj A = 1234 = 4−2−31
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Ex 4.5, 1
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Chapter 4 Class 12 Determinants (Term 1)
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