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If a visual model has a big square of area a² and a small corner of area b² removed, which product can represent the remaining area after rearrangement?

Answer and explanation

Correct answer: (a+b)(a-b)

The correct answer is D: (a+b)(a-b). The original large square has area a², and removing the small square of area b² leaves a²-b². The difference-of-squares identity states a²-b²=(a+b)(a-b). A visual cut-and-rearrange model shows that the remaining pieces can be rearranged into a rectangle whose two side lengths are a+b and a-b, without changing total area. Option A is the square of a+b and is generally too large; it represents a different identity. Option B includes only a and a+b, so it does not equal a²-b² in general. Option C has b as one factor and also gives the wrong area. Memory cue: difference of two squares always factors as sum × difference.

Related tags

Difference Of SquaresVisual RearrangementFactorisationArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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