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A model converts (2x^2+7x+3) into a rectangle. Which split gives the correct visual construction?

Answer and explanation

Correct answer: 2x^2+x+6x+3

The direct answer is B. To build a rectangle from 2x^2+7x+3, split the middle term into two terms so that their sum is 7x and the factor grouping works with 2x^2 and 3. The numbers 1 and 6 add to 7, and their product is 6; this agrees with the product of the outside coefficients 2×3=6. Therefore 2x^2+7x+3=2x^2+x+6x+3. Group the visual tiles: (2x^2+x)+(6x+3)=x(2x+1)+3(2x+1)=(2x+1)(x+3). A uses 2 and 5, whose product is 10, not 6. C uses 3 and 4, whose product is 12, so it does not make equal factors. D breaks the middle term into a constant 7 and does not preserve like terms. Thus B gives the correct rectangle construction. Memory cue: for ax^2+bx+c, find two middle coefficients with sum b and product ac.

Related tags

Area-FactorisationMiddle-Term-SplitRectangle-ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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