Multiple Choice Question (MCQ)

For i=\sqrt{-1} ,what is the sum of (7+3i)+(−8+9i)?

  1. ✓

    -1+12i

  2. ×

    -1-6i

  3. ×

    15+12i

  4. ×

    15-6i

Collected in the board: Imaginary number

Steven Zheng posted 2 years ago

Answer

  1. To add or subtract two complex numbers, just add or subtract the corresponding real and imaginary parts.

    Sum of the real parts of (7+3i) and (−8+9i)

    7+(-8) = -1

    Sum of the imaginary parts of (7+3i) and (−8+9i)

    3+9=12

    The result is -1+12i

    Correct choice is A

Steven Zheng posted 2 years ago

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