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JAMB Mathematics 2007 Question 27

Question 27

Matrices and Determinants

Evaluate (3 −2; −7 5) + 2(−2 4; 3 −1) (matrices written row by row)

  1. A.(3 4; −2 6)
  2. B.(−1 6; −1 3)
  3. C.(−1 6; 1 3)
  4. D.(3 4; 2 6)
Show the answer and explanation

Answer: B ((−1 6; −1 3))

Explanation

2(−2 4; 3 −1) = (−4 8; 6 −2). Adding: (3 − 4, −2 + 8; −7 + 6, 5 − 2) = (−1 6; −1 3).