Example 7 - Find 2A - B if A = [1 2 3 2 3 1], B = [3 -1 3 - Addition/ subtraction  of matrices

  1. Chapter 3 Class 12 Matrices
  2. Serial order wise
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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)] Now, 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)]

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