A square park has 20-foot sides. It is surrounded by a sidewalk that is x feet wide. Which function describes the area of the sidewalk?

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A square park has 20-foot sides. It is surrounded by a sidewalk that is <em>x</em> feet wide. Which function describes the area of the sidewalk?<br><img src='https://www.fatskills.com/images2/GradExams/K12MATH012-81.png' height='84' width='90'/>