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A square model shows three types of parts: a², 2ab, and b². This is the visual proof of which identity?

Answer and explanation

Correct answer: (a + b)² = a² + 2ab + b²

Direct answer: Option D is correct. Imagine a large square whose side is a+b. Its area is therefore (a+b)². Divide each side into lengths a and b. The large square is then split into one square of side a, with area a²; two rectangles with sides a and b, each having area ab; and one square of side b, with area b². Adding the four non-overlapping areas gives a²+ab+ab+b², which simplifies to a²+2ab+b². Thus (a+b)²=a²+2ab+b². Option A is the difference-of-squares identity and has no 2ab part. Option B wrongly omits the two rectangles. Option C has an incorrect middle term and sign. Memory cue: the square of a sum contains first square, twice the product, and second square.

Related tags

Visual ProofBinomial SquareAlgebraic IdentitiesArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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