Question 21
VectorsIf PQ = −2i + 5j and RQ = −i − 7j, find PR.
- A.−3i + 12j
- B.−3i − 12j
- C.−i + 12j
- D.i − 12j
Show the answer and explanation
Answer: C (−i + 12j)
Explanation
PR = PQ + QR = PQ − RQ = (−2i + 5j) − (−i − 7j) = −i + 12j.
If PQ = −2i + 5j and RQ = −i − 7j, find PR.
Answer: C (−i + 12j)
PR = PQ + QR = PQ − RQ = (−2i + 5j) − (−i − 7j) = −i + 12j.