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If in the square model of (x+a)², each rectangle has area 11x, what will the final small square be?

Answer and explanation

Correct answer: 121

The direct answer is B: 121. In the visual model for (x+a)², each of the two rectangles has side lengths x and a, so its area is ax. We are told that ax=11x. For x not equal to zero, comparing the common factor x gives a=11. The remaining small square has both sides equal to a, so its area is a²=11²=121. A is only 2a, not the area of the small square. C incorrectly keeps x²; x² is the area of the large x-square, not the small constant square. D is 2ax, which represents the combined area of the two rectangles, not the final square. The model therefore contains x², 11x, 11x and 121. Memory cue: one rectangle gives ax; the last small square gives a².

Related tags

Algebra TilesUnknown ConstantPerfect SquareArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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