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JAMB Mathematics 1994 Question 25

Question 25

Matrices and Determinants

The determinant of matrix (1 2 3; 4 5 6; 2 0 −1) is

Diagram for this question
  1. A.−67
  2. B.−57
  3. C.−3
  4. D.3
Show the answer and explanation

Answer: C (−3)

Explanation

Expand along the first row: 1(5×(−1) − 6×0) − 2(4×(−1) − 6×2) + 3(4×0 − 5×2) = −5 + 32 − 30 = −3.