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In the visual model of the identity (a+b)², how is the larger square divided?

Answer and explanation

Correct answer: A square of side a+b containing one a² square, one b² square, and two ab rectangles

Correct answer: A. The outer figure is a square because both of its sides have length a+b. Divide each side into parts a and b. The four regions are an a by a square with area a², an a by b rectangle with area ab, a b by a rectangle with area ab, and a b by b square with area b². Adding them gives a²+ab+ab+b²=a²+2ab+b²=(a+b)². Option B describes dimensions associated with a difference of squares and omits the two ab regions. Option C uses the wrong outer side, a−b, and therefore cannot model (a+b)². Option D separates the two small squares and leaves out the connecting rectangles, so it misses the 2ab part. Memory cue: a binomial square always has two equal cross-rectangles.

Related tags

Algebraic IdentitiesVisual ModelArea ModelBinomial SquareClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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