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WAEC Further Mathematics 2016 Question 20

Question 20

Matrices and Determinants

If P = (1 2 / 5 1) and Q = (0 1 / 1 3), find PQ. (Matrices written row by row; / separates the rows.)

  1. A.(5 1 / 16 5)
  2. B.(2 16 / 1 10)
  3. C.(2 7 / 1 8)
  4. D.(2 5 / −1 −8)
Show the answer and explanation

Answer: C ((2 7 / 1 8))

Explanation

PQ = (0 + 2, 1 + 6 / 0 + 1, 5 + 3) = (2 7 / 1 8).