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WAEC Further Mathematics 2008 Question 24

Question 24

Vectors

Given that AB = 5i + 3j and AC = 2i + 5j, find BC.

  1. A.−7i − 8j
  2. B.−3i + 2j
  3. C.3i − 2j
  4. D.3i + 8j
Show the answer and explanation

Answer: B (−3i + 2j)

Explanation

BC = AC − AB = (2i + 5j) − (5i + 3j) = −3i + 2j.