Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 3 - Section 3.5 - Complex Zeros and the Fundamental Theorem of Algebra - 3.5 Exercises - Page 294: 37

Answer

$P(x)=x^{2}-2x+2$

Work Step by Step

The degree is 2, there are 2 complex zeros. $[x-(1+i)]$ and $[x-(1-i)] $are factors. $(x-1-i)$ and $(x-1+i) $are factors. So, $P(x)=a(x-1-i)(x-1+i),$ ... taking $a=1$, ... applying a difference of squares, $P(x)=[(x-1)-i)][(x-1)+i)]$ $=(x-1)^{2}-i^{2}$ ... apply a square of a difference and $(i^{2}=-1)$ ... $=x^{2}-2x+1-(-1)$ $P(x)=x^{2}-2x+2$
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