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JAMB Mathematics 2014 Question 24

Question 24

Matrices and Determinants

Find the value of the determinant with rows (0 3 2), (1 7 8), (0 5 4).

  1. A.−2
  2. B.12
  3. C.10
  4. D.−1
Show the answer and explanation

Answer: A (−2)

Explanation

Expanding along the first row: 0(28 − 40) − 3(4 − 0) + 2(5 − 0) = 0 − 12 + 10 = −2.