Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 4 - Polynomial and Rational Functions - 4.6 Complex Zeros; Fundamental Theorem of Algebra - 4.6 Assess Your Understanding - Page 241: 33

Answer

$2,3\pm 2i$ $f(x)=(x-2)(x-3+2i)(x-3-2i)$

Work Step by Step

Step 1. Use synthetic division to get a zero $x=2$ as shown in the figure. Step 2. Use the quotient and solve $x^2-6x+13=0$ to get $x=\frac{6\pm\sqrt {36-4(13)}}{2}=\frac{6\pm\sqrt {-16}}{2}=3\pm 2i$ Step 3. Thus $f(x)=(x-2)(x-3+2i)(x-3-2i)$
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