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Which visual model helps explain that (a+b)² is not only a²+b²?

Answer and explanation

Correct answer: A square of side a+b divided into one a² square, one b² square, and two ab rectangles

The direct answer is A. Draw a large square whose side is a+b. Divide both its length and width into parts a and b. The four regions are an a² square, a b² square, and two rectangles, each with area ab. Therefore the total area is a²+ab+ab+b²=a²+2ab+b². This shows visually why simply adding a² and b² leaves out the two cross-regions. Option A includes every region of the large square and is correct. Option B concerns a difference of lengths and does not model the square of a sum. Option C changes the geometric figure and gives no explanation of the identity. Option D hides the internal parts, so it cannot reveal the missing middle term. Common confusion: (a+b)² is not a²+b²; squaring a sum creates two cross-products.

Related tags

Binomial-SquareArea-ModelCross-RegionsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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