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In the area model of a square with side \(a+b\), which part represents the term \(2ab\)?

Answer and explanation

Correct answer: Two rectangles, each with sides \(a\) and \(b\)

Correct answer: A. Divide each side of the large square into lengths a and b. This creates four regions: an a-by-a square with area a², a b-by-b square with area b², and two rectangles. Each rectangle has length a and width b, so each has area ab. Adding the two equal rectangular regions gives ab+ab=2ab. Therefore, the two rectangles together represent the middle term 2ab in (a+b)²=a²+2ab+b². Option B represents only a², and option C represents only b². Option D represents the entire area, namely (a+b)², not just its middle part. Memory cue: the coefficient 2 appears because there are two identical ab rectangles.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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