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Assume that a>b. In the area model of a²−b²=(a+b)(a−b), after removing the smaller square from the larger square and rearranging the remaining pieces, which rectangle is formed?

Answer and explanation

Correct answer: A rectangle with sides a+b and a−b

The direct answer is A. Start with an a-by-a square of area a² and remove a b-by-b square of area b². The remaining L-shaped pieces together have area a²−b². After cutting and rearranging those pieces, one side becomes a+b, while the other becomes a−b. Its area is therefore (a+b)(a−b), and expanding gives a²−b² because the +ab and −ab contributions cancel. B would have area (a−b)², not the required difference. C would have area (a+b)². D has area ab and does not match. The condition a>b ensures a−b is a positive length. Memory cue: difference of squares always factors into conjugate factors.

Related tags

Algebraic IdentitiesDifference Of SquaresArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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