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In a square visual model, each side of the large square is divided into two parts, a and b. The model forms four regions with areas a², ab, ab, and b². Which algebraic identity does it represent?

Answer and explanation

Correct answer: (a+b)²=a²+2ab+b²

The direct answer is A. Each side of the large square is divided into adjacent lengths a and b, so the full side is a+b. The total area is therefore (a+b)². Adding the four regions gives a²+ab+ab+b², and the two like terms ab combine to 2ab. Thus (a+b)²=a²+2ab+b². B would require the mixed regions to be subtracted, not shown as two positive areas. C uses side lengths a+b and a−b and gives a²−b², so its middle terms cancel. D is a cubic identity involving a three-dimensional-style product and four cubic terms, not this square area model. Memory cue: two positive ab rectangles produce the middle term +2ab.

Related tags

Algebraic IdentitiesVisual ModelsSquare AreaBinomial ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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