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In the rectangle model of \((3y+2)(y+4)\), what is the total \(y\)-term?

Answer and explanation

Correct answer: \(14y\)

Answer: A, \(14y\). An area model for \((3y+2)(y+4)\) has four products. The product \(3y\cdot y\) gives \(3y^2\), and the product \(2\cdot4\) gives the constant \(8\). The two remaining mixed rectangles are \(3y\cdot4=12y\) and \(2\cdot y=2y\). Both contain one \(y\), so both contribute to the total linear term. Adding them gives \(12y+2y=14y\). Therefore the full product is \(3y^2+14y+8\). Option A is correct. Option B, \(6y\), is not produced by the required multiplication. Option C is only the first mixed rectangle, while D is only the second mixed rectangle. The word “total” is important: it asks for both mixed parts together, not one part alone. Memory cue: the linear term is always the sum of the two cross-products.

Related tags

Linear-TermRectangle-ModelArea ModelLike TermsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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