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If \(x^2+2xy+y^2\) is explained by an area model, what will be the outer side?

Answer and explanation

Correct answer: \(x+y\)

Correct answer: B. Compare the expression with the identity (p+q)²=p²+2pq+q². Here p=x and q=y, so x²+2xy+y²=(x+y)². A square area is the square of its outer side; therefore the side of the model is x+y. Visually, the model has an x-by-x square, two x-by-y rectangles, and a y-by-y square. Option A would represent (x−y)² and would have −2xy. Option C would produce (2x+y)²=4x²+4xy+y², while option D would produce x²+4xy+4y²; neither matches the given expression. Memory cue: positive two-times-product means add the two side labels.

Related tags

Outer SideSquare IdentityXy RectanglesArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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