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In the visual area model of a square with side a + b, which statement is correct?

Answer and explanation

Correct answer: Two rectangles, each with area ab, appear.

The correct answer is B. Imagine dividing each side of the large square into two lengths, a and b. These divisions create four regions: one square with side a and area a², one square with side b and area b², and two rectangles. Each rectangle has length a and width b, so each has area ab. Therefore, the complete area is a² + ab + ab + b² = a² + 2ab + b². Option A is wrong because there is only one a² square. Option C is wrong because the b² corner square is present. Option D is wrong because it omits one ab rectangle and therefore misses the middle term 2ab. Memory cue: the square of a sum has two cross-products: (a + b)² = a² + 2ab + b².

Related tags

Algebraic IdentitiesVisual ModelsArea ModelSquare Of BinomialVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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