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Why are (a^2+2ab+b^2) and ((a+b)^2) equal in an area model?

Answer and explanation

Correct answer: Both show the area of the same square

Direct answer: A, because both expressions represent the area of the same square. In the model, the outer square has side a+b, so its area is (a+b)². If the square is divided into one a-by-a square, two a-by-b rectangles, and one b-by-b square, the sum of the parts is a²+ab+ab+b² = a²+2ab+b². The pieces exactly fill the same outer square, so their total area must equal the area calculated from its full side. B is wrong because the expressions concern area, not perimeter. C is wrong because the expressions are not always zero. D is wrong because they describe areas, not merely lines. The diagram provides a visual proof of the identity (a+b)² = a²+2ab+b².

Related tags

Area EqualityVisual ProofPerfect Square IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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