If →PQ = -2i + 5j and →RQ = -i – 7j, find →PR

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Further Mathematics WAEC 2022

If →PQ = -2i + 5j and →RQ = -i – 7j, find →PR

  • -3i + 12j
  • -3i - 12j
  • -i + 12j checkmark
  • i - 12j

The correct answer is: C

Explanation

→PQ = →PR + →RQ
→PR = →PQ  -  →RQ
→PR = -2i + 5j - (-i - 7j)
→PR = -2i + 5j + i + 7j
→PR = -i + 12j.

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