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When a²-b² is changed into a rectangle in an area diagram, what are the sides of the rectangle?

Answer and explanation

Correct answer: a+b and a-b

The correct answer is B: a+b and a-b. The expression a²-b² is the difference between two squares. The difference-of-squares identity gives a²-b²=(a+b)(a-b). Therefore, when the remaining pieces are rearranged into one rectangle, its side lengths are a+b and a-b. Option A gives a rectangle of area ab, not a²-b². Option C treats the areas a² and b² as if they were side lengths; multiplying them would give a²b², not the required expression. Option D gives area 4ab, which is also different. The rearrangement changes the shape but preserves area, so the product of the new sides must equal the original difference. Memory cue: for two squares, factor as sum of roots multiplied by difference of roots.

Related tags

Difference Of SquaresRectangle SidesFactorisationVisual ProofVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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