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In the visual model of the difference of two squares, into what shape can the remaining L-shaped region be rearranged after removing the smaller square from the larger square?

Answer and explanation

Correct answer: A rectangle whose sides equal the sum and difference of the two square sides

The correct answer is A. Let the side of the larger square be a and the side of the smaller square be b, with a>b. Removing the b by b square from the a by a square leaves an L-shaped region of area a^2-b^2. By cutting one part of this L-shape and shifting it, the pieces can be rearranged into a rectangle. Its two side lengths are a+b and a-b, so its area is (a+b)(a-b), which equals a^2-b^2. Option B would have area (a+b)^2, which is too large and represents a different identity. Option C does not preserve the required rectangular area relationship. Option D describes a special kind of parallelogram, not the standard rearrangement. Memory cue: difference of squares becomes a rectangle with sum on one side and difference on the other.

Related tags

Difference-Of-SquaresArea-RearrangementVisual-IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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