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Which algebraic expression is represented when one large square is divided into four parts: one square, two equal rectangles, and one smaller square?

Answer and explanation

Correct answer: (a + b)²

Direct answer: Option A, (a + b)², is correct. Imagine that each side of the large square is split into lengths a and b. The complete side is therefore a + b, so the total area is (a + b)². The four regions have areas a² for the first square, ab and ab for the two equal rectangles, and b² for the smaller square. Adding them gives a² + ab + ab + b² = a² + 2ab + b², which is exactly (a + b)². Option B represents a subtraction arrangement and has a negative middle term, −2ab. Option C is the difference of two squares and normally represents a rectangle, not this four-part square. Option D omits both rectangular regions. A useful cue is that two positive equal rectangles always contribute +2ab.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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