Where did the square go and how did we get -4 as a coefficient

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
ChapterP: Prerequisites
SectionP.1: Review Of Real Numbers And Their Properties
Problem 11ECP
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Where did the square go and how did we get -4 as a coefficient

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