Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 5 - Cumulative Test for Chapters 3-5 - Page 416: 5


$x=±2i$ $x=-2$

Work Step by Step

$f(x)=0$ $x^3+2x^2+4x+8=0$ $x^2(x+2)+4(x+2)=0$ $(x^2+4)(x+2)=0$ $x^2+4=0$ $x^2=-4$ $x=±\sqrt {-4}=±2i$ $x+2=0$ $x=-2$
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