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Multiplying Complex Numbers - Problem 4

Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

The basis of multiplying complex numbers of the form a + bi is that i squared is defined as negative one. After you distribute or FOIL, you will have integers, terms that still have i, and other terms that are multiplied by i squared (negative one.) If you have a square root of a negative number, write it in terms of i first, and then do the multiplying. Lastly, as a convention, we write our real part first, and the imaginary part second.

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