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In a square model, the large square has area a² and a small square of area b² is removed. If the remaining part is rearranged into a rectangle, how is its area written?

Answer and explanation

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

The direct answer is D: (a-b)(a+b). The original large square has area a², and the removed small square has area b². Therefore the remaining area is a²-b². The difference-of-squares identity says a²-b²=(a-b)(a+b), so when the remaining pieces are rearranged into a rectangle, its side lengths are a-b and a+b. Option A, (a-b)², would describe a square whose two sides are both a-b; it is not the difference between two square areas. Option B adds the two areas even though one square was removed. Option C, 2ab, is the total of the two cross-rectangle areas in (a+b)², not the remaining area here. Memory cue: removing one square from another means subtract first; a difference of squares factors into the sum and difference of the sides.

Related tags

Difference Of SquaresRearranged RectangleVisual ProofFactorisationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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