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How many x-rectangle tiles appear in a square with side (x+1)?

Answer and explanation

Correct answer: 2

Direct answer: Option A, two tiles. A square with side x+1 can be divided by marking lengths x and 1 along both directions. Its area is (x+1)². Multiplying the side lengths gives x²+2x+1. In the visual model, x² is one large square, 1 is one unit square, and the middle term 2x is formed by two rectangles: one has dimensions x by 1 across the top, and the other has dimensions 1 by x along the side. Therefore there are exactly two x-rectangle tiles. B counts only one direction and misses the second rectangle. C has no matching term in the expansion. D would produce a middle contribution of 4x, not 2x. Memory cue: in a square model, the two crosswise strips are equal, so the x contribution is doubled.

Related tags

Algebra TilesX TilesVisual SquareBinomial ExpansionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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