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WAEC Further Mathematics 2018 Question 21

Question 21

Matrices and Determinants

If the determinant of the matrix (2 x / 3 5) = 13, find the value of x. (Matrix written row by row; / separates the rows.)

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

Answer: B (−1)

Explanation

10 − 3x = 13, so x = −1.