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If (x^2+20x+100) is made with square tiles, what is the area of each of the two equal rectangles?

Answer and explanation

Correct answer: 10x

The correct answer is B, 10x. In an area model, x^2 is represented by a square of side x, and 100 is represented by a square of side 10 because 10^2=100. The middle term 20x must be made from two equal rectangular parts, so it is split as 10x+10x. Each rectangle therefore has one side x and the other side 10, giving area 10×x=10x. A is wrong because 20x is the combined area of both rectangles, not one rectangle. B is correct because two copies give 20x. C is wrong because 100x does not represent the middle term. D is wrong because two copies of 5x give only 10x. Memory cue: when the middle term is divided into two equal visual parts, halve its coefficient.

Related tags

Equal-RectanglesComplete-SquareVisual-TilesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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