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In a square model, x² + 2xy + y² is the area of a square with which side?

Answer and explanation

Correct answer: x + y

The correct answer is C. Start with the area formula for a square: area = side × side = side². The identity (x + y)² = x² + 2xy + y² shows that the given expression is the square of x + y. In a visual model, one x-by-x square contributes x², one y-by-y square contributes y², and two x-by-y rectangles contribute xy + xy = 2xy. Together they make a square whose side is x + y. Option A gives (x − y)² = x² − 2xy + y², with a negative middle term. Option B is a product, not a side of this square. Option D is an expression for an area, not the required side. Memory cue: positive 2xy means “plus” between x and y.

Related tags

Square ModelPerfect Square IdentityArea RepresentationAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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