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WAEC Further Mathematics 2009 Question 32

Question 32

Matrices and Determinants

Evaluate (2 3; 4 1)(2, 3)

  1. A.(13, 11)
  2. B.(11, 13)
  3. C.column vector (13, 11)
  4. D.column vector (11, 13)
Show the answer and explanation

Answer: C (column vector (13, 11))

Explanation

Multiply rows by the column: 2 × 2 + 3 × 3 = 13 and 4 × 2 + 1 × 3 = 11, giving a column vector with entries 13 and 11.