Example 14 - Chapter 3 Class 12 Matrices
Last updated at Dec. 16, 2024 by Teachoo
Last updated at Dec. 16, 2024 by Teachoo
Example 14 If A = [■8(1&0@0&−1)] and B = [■8(0&1@1&0)] , find AB and BA. Prove that AB ≠ BA AB = [■8(1&0@0&−1)] [■8(0&1@1&0)] = [■8(1(0)+0 (1)&1(1)+0 (0)@0(0)+(−1)(1)&0(1)+(−1) (0))] = [■8(0+0&1+0`@0−1&0+0)] = [■8(𝟎&𝟏@−𝟏&𝟎)] BA = [■8(0&1@1&0)][■8(1&0@0&−1)] = [■8(0(1)+1(0)&0(0)+1(−1)@1(1)+0 (0)&1(0)+0 (−1))] = [■8(0+0&0−1@0+1&0+0)] = [■8(𝟎&−𝟏@𝟏&𝟎)] ≠ AB Since AB ≠ BA Hence proved
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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