Answer
$-i, i, 3$
Work Step by Step
$x^3+x-3x^2-3=0$
$x(x^2+1)-3(x^2+1)=0$
$(x^2+1)(x-3)=0$
$x-3=0$
$x=3$
$x^2+1=0$
$x^2=-1$
$\sqrt {x^2}=\sqrt {-1}$
$x=±i$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 11 - Section 11.3 - Solving Equations by Using Quadratic Methods - Exercise Set - Page 790: 74
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