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A square visual model is divided into one large square, one small square, and two rectangles of equal area. If the areas of these parts are a², b², and ab, ab respectively, which algebraic identity does the model represent?

Answer and explanation

Correct answer: (a+b)²=a²+2ab+b²

The direct answer is A. The two square pieces contribute a² and b². The two equal rectangles each have area ab, so together they contribute 2ab. Adding all four regions gives a²+ab+ab+b²=a²+2ab+b². The outside side is formed by adding the corresponding lengths a and b, so the whole figure has area (a+b)². Therefore the model represents (a+b)²=a²+2ab+b². B would require negative cross terms, associated with a difference. C represents multiplying a sum and a difference, not adding the four positive parts of one square. D is the cube of a binomial and is not an area decomposition into these four quadratic regions. Memory cue: two ab rectangles mean a positive 2ab middle term.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelSquare Of BinomialClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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