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 293: 22

Answer

Zeros, each multiplicity 1: $4+i,\quad 4-i$ Factorization: $P(x)=(x-4-i)(x-4+i)$

Work Step by Step

$x^{2}-8x+17=0$ Quadratic formula: $x=\displaystyle \frac{-b\pm\sqrt{b^{2}-4ac}}{2a},\quad a=1, b=-8, c=17$ $x=\displaystyle \frac{8\pm\sqrt{64-4(1)(17)}}{2(1)}=\frac{8\pm\sqrt{-4}}{2}$ $=\displaystyle \frac{8\pm 2i}{2}=\frac{2(4\pm i)}{2}=4\pm i$ Zeros, each multiplicity 1: $4+i,\quad 4-i$ Factorization: $1[x-(4+i)][x-(4-i)]=$ $P(x)=(x-4-i)(x-4+i)$
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