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In a square with side (a+b), what shape is the a² part?

Answer and explanation

Correct answer: A square of side a

Direct answer: A, a square of side a. In the area model for (a+b)², each full side is split into lengths a and b. The region where the a part meets the a part has dimensions a by a. Its area is a×a=a², so it must be a square whose side is a. B describes the b² corner region. C has area ab, so it represents one of the two rectangular cross-regions, not a². D refers to the outside figure and does not describe the a² subregion. The complete model contains one a² square, two ab rectangles, and one b² square, giving a²+2ab+b². A common confusion is to read a² as a side length; it is an area, and the corresponding side is a.

Related tags

Square PartArea ModelVisual IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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