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Which algebraic identity is represented by a visual model dividing a large square into areas a², ab, ab, and b²?

Answer and explanation

Correct answer: (a+b)² = a² + 2ab + b²

Direct answer: Option A. The four regions have areas a², ab, ab, and b². Adding them gives a²+ab+ab+b²=a²+2ab+b². The outer shape is a square whose side is made from lengths a and b, so its side is a+b and its total area is (a+b)². Equating the total area with the sum of its parts gives (a+b)²=a²+2ab+b². B would require negative middle regions, which this ordinary area model does not show. C and D are equivalent difference-of-squares statements and would involve subtraction rather than two positive ab rectangles. The useful check is to count both ab regions before selecting the identity.

Related tags

Algebraic IdentitiesVisual ModelsSquare Of BinomialArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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