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In a square tile model, one x^2 square, two xy rectangles, and one y^2 square combine to form a larger square. Which algebraic identity does this model represent?

Answer and explanation

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

The correct answer is A. The large square has side length x+y, so its area is (x+y)^2. Its tiles consist of one x^2 square, two xy rectangles, and one y^2 square. Adding their areas gives x^2+xy+xy+y^2=x^2+2xy+y^2. Therefore, (x+y)^2=x^2+2xy+y^2. B is wrong because the two middle tiles would need negative values for the subtraction identity. C represents a rectangle made from the sum and difference of the sides and has no middle term after cancellation. D is false because the cross-area 2xy is missing from its right side. The two identical xy tiles are the visual reason for the coefficient 2. Memory cue: one first square, two cross rectangles, and one last square means the plus perfect-square identity.

Related tags

Algebraic-IdentitiesVisual-ModelsArea-ModelPerfect-SquareTrinomialsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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