Example 7 - Chapter 3 Class 12 Matrices

Last updated at August 2, 2026 by

Example 7 - Find 2A - B if A = [1 2 3 2 3 1], B = [3 -1 3 - Examples

part 2 - Example 7 - Examples - Serial order wise - Chapter 3 Class 12 Matrices

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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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