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WAEC Further Mathematics 2007 Question 29

Question 29

Matrices and Determinants

Given that P = (4 9) and Q = (−1 −2; 3 2), evaluate |Q| P.

  1. A.(16 36)
  2. B.(8 18)
  3. C.(8 0)
  4. D.(1 2)
Show the answer and explanation

Answer: A ((16 36))

Explanation

|Q| = (−1)(2) − (−2)(3) = −2 + 6 = 4, so |Q|P = 4(4 9) = (16 36).