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Which set of regions is shown in an area model for the identity \((a+b)^2\)?

Answer and explanation

Correct answer: \(a^2,\ ab,\ ab,\ b^2\)

The correct answer is A: \(a^2,ab,ab,b^2\). A square with side \(a+b\) is divided into an a-by-a square, an a-by-b rectangle, a b-by-a rectangle, and a b-by-b square. Their areas are respectively \(a^2\), \(ab\), \(ab\), and \(b^2\). Adding these four regions gives \(a^2+ab+ab+b^2=a^2+2ab+b^2\), which is the expansion of \((a+b)^2\). Option B leaves out one of the two middle rectangles. Option C combines terms while also giving the wrong last term, and it does not list the actual regions. Option D lists three b² regions, but the model contains only one b² square. Remember: an area model shows the separate pieces before like terms are combined.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelSquare Of BinomialClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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