Slide7.JPG

Slide8.JPG
Slide9.JPG

Go Ad-free

Transcript

Ex 4.4, 3 Verify A (adj A) = (adj A) A = |𝐴| I, where A = [■8(2&3@−4&−6)] Let A = [■8(2&3@−4&−6)] adj A = [■8(2&3@−4&−6)] = [■8(−6&−3@4&2)] |𝐴| = |■8(2&3@−4&−6)| = 2 × (–6) – 3 × (–4) = –12 + 12 = 0 Calculating A (adj A) = [■8(2&3@−4&−6)] [■8(−6&−3@4&2)] = [■8(2 ×(−6)+3 ×4&2 ×−3+3×2@−4 ×(−6)+(−6) ×4&−4 ×(−3)+(−6) ×2)] = [■8(−12+12&−6+6@+ 24 −24&12−12)] = [■8(0&0@0&0)] Similarly (adj A)A = [■8(−6&−3@4&2)] [■8(2&3@−4&−6)] = [■8(− 6(2)+(−3) (−4)&−6(3)+(−3)(−6)@4(2)+2(−4)&4 (3)+2 (−6))] = [■8(−12+12&−18+18@8 − 8&12−12)] = [■8(0&0@0&0)] Also |A| I = 0I = O ∴ A (adj A) = (adj A)A = |A|I Hence Proved

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo