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If x^2+2xy+y^2 is made with tiles, what will be the outer side?

Answer and explanation

Correct answer: x+y

The direct answer is D: x+y. Recognize the expression as a perfect-square identity: x^2+2xy+y^2=(x+y)^2. In a tile model, the x^2 tile is a square with side x, the y^2 tile is a square with side y, and the two xy tiles are rectangles with sides x and y. These four tiles fit together to form one larger square. Since its area is (x+y)^2, the side of that square is x+y. A is incorrect because (x-y)^2=x^2-2xy+y^2, which has a negative middle term. B is the area of one xy rectangle, not the outer side. C would produce (2x+y)^2=4x^2+4xy+y^2, which is not the given expression. D matches both the tile arrangement and the identity. A reliable method is to take the square roots of the first and last terms, x and y, and check that the middle term is +2xy. Memory cue: x^2, two xy tiles, and y^2 make a positive square (x+y)^2.

Related tags

Algebra TilesOuter SidePerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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