# Chapter 11 - Additional Topics - 11.4 - Complex Numbers - Problem Set 11.4 - Page 493: 29

$-20-8i$

#### Work Step by Step

We first use the distributive property to simplify. Then, we combine like terms to obtain: $(-10-4i)-(10+4i)$ =$-10-4i-10-4i$ =$-10-10-4i-4i$ =$-20-8i$

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