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JAMB Mathematics 2010 Question 25

Question 25

Matrices and Determinants

If |x 3; 2 7| = 15, find the value of x. (Determinant written row by row.)

  1. A.3
  2. B.5
  3. C.4
  4. D.2
Show the answer and explanation

Answer: A (3)

Explanation

7x − 6 = 15, so 7x = 21 and x = 3.