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Why do two rectangles of area ab appear in the visual model of a square with side a+b?

Answer and explanation

Correct answer: Because the sides a and b combine in two directions to form two ab regions.

The direct answer is A. Divide each side of the large square into lengths a and b. The resulting four regions are an a-by-a square, an a-by-b rectangle, a b-by-a rectangle, and a b-by-b square. The two mixed rectangles have areas a×b=ab and b×a=ab. They are different positions in the model, although their numerical areas are equal, so together they contribute 2ab. B is wrong because the a² square is not what creates the mixed rectangles. C reverses the containment relationship; the b² square is a separate corner region. D omits both mixed regions and gives an incomplete total. Memory cue: the two cross-products in (a+b)(a+b) are ab+ab.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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