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Which algebraic expression is represented by a visual model consisting of one large square containing a square of area x², a square of area y², and two equal rectangles, each of area xy?

Answer and explanation

Correct answer: (x + y)²

Direct answer: A, (x + y)². Imagine dividing a large square whose side is x + y into four parts. The x-by-x part has area x², the y-by-y part has area y², and the two remaining rectangles have areas xy and xy. Adding all four areas gives x² + xy + xy + y² = x² + 2xy + y². This is exactly the identity (x + y)². Option A is correct because it includes the two positive middle rectangles. Option B, (x − y)², represents a subtraction model and has negative middle terms, not two positive xy rectangles. Option C, x² − y², represents the difference of two squares and has no 2xy term. Option D, x² + y², includes only the two square areas and leaves out both rectangles. Memory cue: a plus binomial square has the pattern first square + twice the product + second square.

Related tags

Algebraic IdentitiesVisual Area ModelBinomial SquareClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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