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If the tile model of 3x² + 10x + 3 forms a factor rectangle, which sides are correct?

Answer and explanation

Correct answer: (3x + 1) and (x + 3)

The direct answer is C: the rectangle sides are 3x + 1 and x + 3. In a tile model, the product of the side lengths must reproduce the complete polynomial. Multiply term by term: (3x + 1)(x + 3) = 3x·x + 3x·3 + 1·x + 1·3 = 3x² + 9x + x + 3 = 3x² + 10x + 3. Thus every tile region is accounted for: one x² region, ten x regions in total, and one constant region of 3. A is wrong because (3x + 10)(x + 3) = 3x² + 19x + 30. B is wrong because (3x + 3)(x + 1) = 3x² + 6x + 3. C matches all coefficients. D gives x² + 10x + 9, so even its leading and constant terms differ. Memory cue: check first-term product, cross-term sum, and constant product.

Related tags

Visual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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