Chapter 1 - Section 1.3 - Complex Numbers; Quadratic Equations in the Complex Number System - 1.3 Assess Your Understanding - Page 111: 18

$-8-32i$

$\bf{\text{Solution Outline:}}$ To simplify the given expression, $ -4(2+8i) ,$ use the Distributive Property. $\bf{\text{Solution Details:}}$ Using the Distributive Property which is given by $a(b+c)=ab+ac,$ the expression above is equivalent to \begin{array}{l}\require{cancel} -4(2)-4(8i) \\\\= -8-32i .\end{array}