JAMB and WAEC Mathematics questions: Matrices and determinants

25 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Matrices and determinants· JAMB

   P is a 2 × 3 matrix and Q is a 3 × 4 matrix. The product PQ is

   • Aa 2 × 4 matrix
   • Ba 3 × 3 matrix
   • Ca 4 × 2 matrix
   • Dnot defined

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   Explanation and discussion

2. Question 22· Matrices and determinants· JAMB

   Find the determinant of the matrix [[2, 3], [1, 4]].

   • A11
   • B5
   • C8
   • D−5

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   Explanation and discussion

3. Question 23· Matrices and determinants· JAMB

   If A = [[1, 2], [3, 4]] and B = [[0, 1], [1, 0]], find A + B.

   • A[[0, 2], [3, 0]]
   • B[[1, 2], [3, 4]]
   • C[[1, 3], [4, 4]]
   • D[[2, 1], [4, 3]]

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   Explanation and discussion

4. Question 24· Matrices and determinants· JAMB

   A has rows (1, 2) and (3, 4). Find A².

   • Arows (2, 4) and (6, 8)
   • Brows (1, 4) and (9, 16)
   • Crows (7, 10) and (15, 22)
   • Drows (7, 15) and (10, 22)

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5. Question 25· Matrices and determinants· JAMB

   Evaluate the determinant of [[3, −1], [2, 5]].

   • A17
   • B13
   • C−17
   • D7

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   Explanation and discussion