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In a tile model of a square with side (x+y), there is one (x^2) square, one (y^2) square, and two (xy) rectangles. Which algebraic expression does this model represent?

Answer and explanation

Correct answer: x² + y² + 2xy

Direct answer: A, x² + y² + 2xy. Add the area of every tile. The x by x square contributes x², the y by y square contributes y², and each x by y rectangle contributes xy. Since there are two such rectangles, together they contribute 2xy. The total area is x² + 2xy + y², which is the identity (x+y)². Option B counts only one xy rectangle. Option C uses subtraction and would not match a square whose side is x+y. Option D counts two y² squares and omits both the correct middle contribution and the x-by-y structure. A useful check is to expand (x+y)²: the middle term appears twice because the two cross-rectangles are congruent.

Related tags

Algebra TilesPerfect Square IdentityArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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