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If an area model has four regions with areas x², xy, xy, and y², and together they form one large square, which identity does the model represent?

Answer and explanation

Correct answer: x² + 2xy + y² = (x + y)²

The direct answer is option A. The x² region is a square with side x, and the y² region is a square with side y. The two remaining regions are rectangles, each with area xy. Together they contribute xy + xy = 2xy. Therefore, the total area is x² + 2xy + y². Since the four pieces form one large square whose side is x + y, its area is (x + y)². Thus x² + 2xy + y² = (x + y)². Option B is the difference-of-squares identity and has no two positive xy rectangles. Option C would require negative middle regions. Option D incorrectly leaves out the two xy regions; in general, x² + y² is not equal to (x + y)². Memory cue: two positive cross-rectangles mean a positive 2xy middle term.

Related tags

Algebraic IdentitiesVisual Area ModelPerfect Square TrinomialBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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