Ex 4.1, 6 - Find |A| if A = [1 1 -2 2 1 -3 5 4 -9] - Ex 4.1

  1. Chapter 4 Class 12 Determinants
  2. Serial order wise
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Ex 4.1, 6 If A = 1﷮1﷮−2﷮2﷮1﷮−3﷮5﷮4﷮−9﷯﷯, find A﷯ A﷯ = 1﷮1﷮−2﷮2﷮1﷮−3﷮5﷮4﷮−9﷯﷯ = 1 1﷮−3﷮4﷮−9﷯﷯ – 1 2﷮−3﷮5﷮−9﷯﷯ + (–2) 2﷮1﷮5﷮4﷯﷯ = 1 (1(– 9) – 4(– 3)) –1 (2( – 9) – 5(– 3)– 2(2(4) – 5(1)) = 1 (−9 + 12) + 1 (−18 + 15) – 2 (8 – 5) = − 1(3) − 1 (−3) – 2 (3) = 3 + 3 – 6 = 6 – 6 = 0 Hence A﷯= 0

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