Electrical mathQuestion 159 of 1506

Two vectors are 12, j5 and −4, j7. What is their sum in rectangular form?

  1. 16, j12
  2. 8, −j2
  3. −8, j12
  4. 8, j12
Show answer

Correct answer: 8, j12

Add the X values and the Y values separately: 12 + (−4) = 8 and 5 + 7 = 12.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 2.4: Vector Addition

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Questions last reviewed: 18 October 2026