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A rectangular area model is divided into four parts with areas x², 3x, 2x, and 6. Which factorised expression does this model represent?

Answer and explanation

Correct answer: (x + 3)(x + 2)

The direct answer is option A: (x + 3)(x + 2). In a rectangular area model, adjoining lengths multiply to make each region. The x² region comes from x by x. The 3x region comes from x by 3, and the 2x region comes from x by 2. The remaining corner is 3 by 2, giving 6. Therefore, the two outside side lengths are x + 3 and x + 2, so the factorised expression is (x + 3)(x + 2). Expanding confirms it: x² + 2x + 3x + 6 = x² + 5x + 6. Option B would produce x² + 7x + 6, not the given parts. Option C would have two 3x rectangles and a 9 corner. Option D would have two 2x rectangles and a 4 corner. Read the strip widths along the two sides rather than guessing from the constant term alone.

Related tags

Area ModelFactorisationBinomial ProductsVisual AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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