Answer
See below.
Work Step by Step
The error is in the second step because it should be:
$4(x^2+6x)=11\\4(x^2+6x+9)=11+4\cdot9=11+36$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.7 Complete the Square - 4.7 Exercises - Skill Practice - Page 289: 51
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