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A rectangle area model shows 2x² + 7x + 3. If its sides are 2x + 1 and x + 3, what will the areas of the four small rectangles be?

Answer and explanation

Correct answer: 2x², 6x, x, 3

The correct answer is A. Split one side into 2x and 1, and split the other side into x and 3. Each small rectangle is found by multiplying one horizontal part by one vertical part: (2x)(x) = 2x², (2x)(3) = 6x, (1)(x) = x, and (1)(3) = 3. Adding them gives 2x² + 6x + x + 3 = 2x² + 7x + 3, exactly the stated area. B incorrectly uses 3x instead of (2x)(3) = 6x. C incorrectly uses 2x instead of (1)(x) = x. D incorrectly changes (2x)(x) into x². Thus A is confirmed both by multiplication and by the sum of the cells. Memory cue: label the row and column parts, then multiply across each grid cell.

Related tags

Area ModelRectangle MultiplicationDistributive PropertyAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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