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In a visual model, (x²+2xy+y²) is incorrectly treated as (x²+y²). Which visual part has been ignored?

Answer and explanation

Correct answer: Two xy rectangles

Direct answer: Option A, two xy rectangles. The identity (x+y)²=x²+2xy+y² comes from partitioning a large square into four parts: one square of area x², two rectangles each of area xy, and one square of area y². The two rectangles contribute xy+xy=2xy. If the expression is incorrectly reduced to x²+y², exactly this cross-term contribution has been omitted. Option A is correct. Option B is wrong because x² is still present in the incorrect expression. Option C is wrong because y² is also still present. Option D is wrong because the outer boundary is not the missing algebraic area term; the missing part is inside the model. Common warning: (x+y)² is not x²+y²; always include the two cross rectangles, or the 2xy term.

Related tags

Common MistakeCross TermVisual ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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