Given that a = 5i + 4j and b = 3i + 7j, evaluate (3a
FURTHER MATHEMATICS
WAEC 2017
Given that a = 5i + 4j and b = 3i + 7j, evaluate (3a - 8b).
- A. 9i + 44j
- B. -9i + 44j
- C. -9i - 44j
- D. 9i - 44j
Correct Answer: C. -9i - 44j
Explanation
= 3(5i+4j)?8(3i+7j)=15i+12j?24i?56j = ?9i?44j
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