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If a square of side (p+q) is divided into regions of areas (p^2), (q^2), and two regions of area (pq), which algebraic identity does this visual model represent?

Answer and explanation

Correct answer: (p+q)² = p² + 2pq + q²

Direct answer: A. The whole square has side p+q, so its area is (p+q)². The partition contains one p-by-p square with area p², one q-by-q square with area q², and two p-by-q rectangles. The two rectangles contribute pq+pq=2pq. Adding all regions gives p²+2pq+q², so (p+q)²=p²+2pq+q². B is the square-of-difference identity; it would have negative cross-terms and a side p−q. C is the difference-of-squares identity and involves a product of two different binomials, not this four-region sum. D is false in general because the cross-terms do not disappear in this model. Memory cue: plus side means plus twice the product in the middle.

Related tags

Perfect Square IdentityVisual ProofArea DecompositionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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