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In the visual model of (x²+2xy+y²), what whole shape is formed?

Answer and explanation

Correct answer: A square of side (x+y)

The direct answer is A: a square with side x+y. Start with the identity (x+y)²=x²+2xy+y². In an area model, x² is an x-by-x square, y² is a y-by-y square, and 2xy is made from two rectangles, each having area xy. These four positive regions fit together along two lengths x and y, so the outside length in each direction is x+y. Therefore the complete figure is a square of side x+y. B represents (x−y)²=x²−2xy+y², where the mixed part has a negative sign. C represents (x+y)(x−y)=x²−y², so the mixed terms cancel. D has area only xy and cannot contain all four regions. Memory cue: a positive 2xy means two mixed rectangles are added.

Related tags

Algebraic IdentitiesVisual Area ModelBinomial SquareClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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