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Each side of a square is divided into two parts, x and y. The resulting area model contains x², two xy rectangles, and y². Which algebraic identity does this model represent?

Answer and explanation

Correct answer: \((x+y)^2=x^2+2xy+y^2\)

Correct answer: A. The full side is made by joining lengths x and y, so it is x+y. The whole square therefore has area (x+y)². Its four regions have areas x², xy, xy, and y². Adding them gives x²+xy+xy+y²=x²+2xy+y², proving the identity in option A. Option B describes a difference of lengths and would require negative middle terms; the diagram has two positive xy regions. Option C describes a product of conjugate factors and has no two positive xy rectangles. Option D incorrectly leaves out the two cross regions. Memory cue: count both identical cross-rectangles; they combine to 2xy.

Related tags

Algebraic IdentitiesArea ModelVisual ProofPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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