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A square visual model is divided into one large square, a square of side x, a square of side y, and two equal rectangles with area xy. Which identity does it represent?

Answer and explanation

Correct answer: (x+y)² = x²+2xy+y²

Direct answer: Option A. The outside figure is a square whose side is x+y, so its total area is (x+y)². Inside it are an x by x square with area x², a y by y square with area y², and two x by y rectangles. Together the rectangles have area xy+xy=2xy. Adding all pieces gives x²+2xy+y², which must equal the area of the whole square. Thus (x+y)²=x²+2xy+y². B describes a subtraction arrangement and has a negative middle term. C and D are the difference-of-squares identity, not a square containing two positive xy rectangles. Common warning: two equal positive rectangles mean +2xy, not −2xy.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelPerfect SquareBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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