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Which part is common in the square model of (x+3)² and the rectangle model of (x+3)(x+4)?

Answer and explanation

Correct answer: x²

The correct answer is A: x². In the square model of (x+3)², one region is formed by multiplying x by x, so that region has area x². In the rectangle model of (x+3)(x+4), the x part of the first side and the x part of the second side also form an x-by-x region, again with area x². The expansions confirm this: (x+3)²=x²+6x+9, whereas (x+3)(x+4)=x²+7x+12. Thus x² appears in both models. Option B, 12, is the constant term only in the rectangle model. Option C, 7x, is the combined linear part of the rectangle model and is not the same as the 6x part of the square model. Option D, 9, is the corner square in the first model but not in the second. The common visual block is the x-by-x square.

Related tags

Common-AreaCompare-ModelsQuadratic-ExpressionsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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