Answer
$\pm 1, \pm 3$
Work Step by Step
$x^{4}-10x^{2}+9=0$
$x^{4}-9x^{2}-x^{2}+9=0$
$(x^{4}-9x^{2})+(-x^{2}+9)=0$
$x^{2}(x^{2}-9)-1(x^{2}-9)=0$
$(x^{2}-1)(x^{2}-9)=0$
$x^{2}-1=0$ $ , $ $x^{2}-9=0$
$x=\pm 1$ $ , $ $x=\pm 3$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 0 - Section 0.5 - Solving Polynomial Equations - Exercises - Page 30: 27
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