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A tile model has x², two 3x rectangles, and a small square of area 9. What is the side of the complete square?

Answer and explanation

Correct answer: x+3

The correct answer is B: x+3. The x² tile is a square whose side is x, because x×x=x². The small square has area 9, so its side is 3, because 3×3=9. Each 3x rectangle can be formed with side lengths x and 3. When the x² square, the two 3x rectangles, and the 3×3 square are arranged together, they make a larger square with side x+3. Check the total area: x²+3x+3x+9=x²+6x+9=(x+3)². Option A uses 9 as a side instead of recognising that 9 is an area. Option C would produce (x−3)²=x²−6x+9, with a negative middle term. Option D does not produce the given tile areas. Memory cue: the constant corner area 9 has side √9=3, not 9.

Related tags

Algebra TilesPerfect SquareVisual ModelsComplete SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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