Given that a = 5i + 4j and b = 3i + 7j, evaluate (3a…

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: Option C
Explanation

= (3(5i+4j) – 8(3i+7j) = 15i + 12j – 24i -56j)

= (-9i – 44j)

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