Question 29
VectorsIf s = 3i − j and t = 2i + 3j, find (t + 3s) · (t − 3s).
- A.−77
- B.−71
- C.−53
- D.−41
Show the answer and explanation
Answer: A (−77)
Explanation
t + 3s = 11i + 0j and t − 3s = −7i + 6j. Dot product = 11(−7) + 0(6) = −77.
If s = 3i − j and t = 2i + 3j, find (t + 3s) · (t − 3s).
Answer: A (−77)
t + 3s = 11i + 0j and t − 3s = −7i + 6j. Dot product = 11(−7) + 0(6) = −77.