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A square visual model is divided into four regions: one square of area a^2, another square of area b^2, and two congruent rectangles each of area ab. Which algebraic identity does this model represent?

Answer and explanation

Correct answer: (a+b)^2=a^2+2ab+b^2

The direct answer is A. Add the four regions: the first square contributes a^2, the second contributes b^2, and the two congruent rectangles contribute ab+ab=2ab. Thus the whole square has area a^2+2ab+b^2. Its side is made by joining lengths a and b, so the same whole area is (a+b)^2. Hence (a+b)^2=a^2+2ab+b^2. B would require negative rectangular regions or a subtraction arrangement, not two positive rectangles. C describes a rectangle with sides a+b and a-b, producing a^2-b^2. D incorrectly leaves out the 2ab contribution and is generally false. Memory cue: two positive ab rectangles mean a positive 2ab middle term.

Related tags

Algebraic IdentitiesVisual ModelArea PartitionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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