College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 1 - Equations and Inequalities - Exercise Set 1.6 - Page 179: 98

Answer

The solutions are $x=2$, $x=7$ and $x=-5$

Work Step by Step

$x(x-2)^{3}-35(x-2)^{2}=0$ Take out common factor $(x-2)^{2}$: $(x-2)^{2}[x(x-2)-35]=0$ $(x-2)^{2}(x^{2}-2x-35)=0$ Factor $x^{2}-2x-35$: $(x-2)^{2}(x-7)(x+5)=0$ Set all three factors equal to $0$ and solve each individual equation for $x$: $(x-2)^{2}=0$ $\sqrt{(x-2)^{2}}=\sqrt{0}$ $x-2=0$ $x=2$ $x-7=0$ $x=7$ $x+5=0$ $x=-5$ The solutions are $x=2$, $x=7$ and $x=-5$
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