Answers Precalculus Powers and Roots of Complex Numbers — Unit testQuestion 5

5

QuizMultiple Choice

Powers and Roots of Complex Numbers — Unit test

Question 5 • Precalculus

Let z = 19 + i and w = 4 + 10i.What is the first step in determining zw?

Answer

A

Replace i2 with –1.

B

Multiply z by the conjugate of w.

C

Apply the distributive property or FOIL.

D

Combine the corresponding real and imaginary parts.

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