Question 33
VectorsGiven that a = 5i + 4j and b = 3i + 7j, evaluate (3a − 8b).
- A.9i + 44j
- B.−9i + 44j
- C.−9i − 44j
- D.9i − 44j
Show the answer and explanation
Answer: C (−9i − 44j)
Explanation
3a − 8b = (15 − 24)i + (12 − 56)j = −9i − 44j.
Given that a = 5i + 4j and b = 3i + 7j, evaluate (3a − 8b).
Answer: C (−9i − 44j)
3a − 8b = (15 − 24)i + (12 − 56)j = −9i − 44j.