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WAEC Further Mathematics 2021 Question 3

Question 3

Matrices and Determinants

Given that M = (3 2 / −1 4) and N = (5 6 / −2 −3), calculate (3M − 2N). (Matrices written row by row; / separates the rows.)

  1. A.(1 6 / 1 18)
  2. B.(−1 −6 / 1 18)
  3. C.(1 6 / −1 −18)
  4. D.(−1 −6 / −1 −18)
Show the answer and explanation

Answer: B ((−1 −6 / 1 18))

Explanation

3M = (9 6 / −3 12) and 2N = (10 12 / −4 −6). 3M − 2N = (−1 −6 / 1 18).