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In the area model of a square with side a + b, which shapes represent the term 2ab?

Answer and explanation

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

The correct answer is A. Divide each side of the large square into lengths a and b. The resulting model contains an a by a square with area a², a b by b square with area b², and two cross-rectangles. Each cross-rectangle has sides a and b, so each area is ab. Since there are two such rectangles, their combined area is ab + ab = 2ab. Option B represents only a², not 2ab. Option C represents only b². Option D represents two a² squares, giving 2a², not 2ab. The coefficient 2 comes from the number of identical rectangles, while the product ab comes from their side lengths. Memory cue: in (a + b)², the middle term is made by two equal cross-rectangles.

Related tags

Middle TermArea ModelAlgebraic IdentityCross RectanglesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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