If →PQ = -2i + 5j and →RQ = -i - 7j, find →PR...
FURTHER MATHEMATICS
WAEC 2022
If →PQ = -2i + 5j and →RQ = -i - 7j, find →PR
- A. -3i + 12j
- B. -3i - 12j
- C. -i + 12j
- D. i - 12j
Correct Answer: C. -i + 12j
Explanation
→PQ = →PR + →RQ
→PR = →PQ - →RQ
→PR = -2i + 5j - (-i - 7j)
→PR = -2i + 5j + i + 7j
→PR = -i + 12j.
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