Answer
See explanation
Work Step by Step
In order to complete the square, we have to add $(b/2)^2 $ to each side.
For example,
$6/2=3$
$3^2=9$
$x^2+6x+9=(x+3)^2=9$
We then square root and subtract 3 from each side to get
$$x=\boxed{-6,0}$$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Chapter 1 Review - Concept Check - Page 168: 13
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