Given that a = 5i + 4j and b = 3i + 7j, evaluate (3a – 8b).
- 9i + 44j
- -9i + 44j
-
-9i - 44j
- 9i - 44j
The correct answer is: C
Explanation
= \(3(5i+4j) - 8(3i+7j) = 15i + 12j - 24i -56j\)
= \(-9i - 44j\)