Example 7 - Chapter 3 Class 12 Matrices
Last updated at Dec. 16, 2024 by Teachoo
Last updated at Dec. 16, 2024 by Teachoo
Example 7 If A = [■8(1&2&3@2&3&1)] and B = [■8(3&−1&3@−1&0&2)] then find 2A – B. Finding 2A 2A = 2 [■8(1&2&3@2&3&1)] = [■8(2 × 1&2 × 2&2 × 3@2 × 2&2 × 3&2 × 1)] = [■8(𝟐&𝟒&𝟔@𝟒&𝟔&𝟐)] Finding 2A – B 2A – B = [■8(𝟐&𝟒&𝟔@𝟒&𝟔&𝟐)] − [■8(𝟑&−𝟏&𝟑@−𝟏&𝟎&𝟐)] = [■8(2−3&4−(−1)&6−3@4−(−1)&6−0&2−2)] = [■8(−1&4+1&3@4+1&6&0)] = [■8(−𝟏&𝟓&𝟑@𝟓&𝟔&𝟎)]
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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