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WAEC Further Mathematics 2010 Question 15

Question 15

Matrices and Determinants

If the determinant |3 x / 2 x − 2| = −2, find the value of x. (The determinant is written row by row.)

  1. A.−8
  2. B.−4
  3. C.4
  4. D.8
Show the answer and explanation

Answer: C (4)

Explanation

3(x − 2) − 2x = −2, so x − 6 = −2 and x = 4.