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If a rectangle is formed by \((3y+2)\) and \((y+4)\), what is the total \(y\)-term?

Answer and explanation

Correct answer: \(14y\)

Answer: A, \(14y\). Multiply the two side expressions: \((3y+2)(y+4)\). The four area pieces are \(3y\cdot y=3y^2\), \(3y\cdot4=12y\), \(2\cdot y=2y\), and \(2\cdot4=8\). The terms containing exactly one factor of \(y\) are the two mixed products, \(12y\) and \(2y\). They are like terms, so add their coefficients: \(12y+2y=14y\). Thus the complete expansion is \(3y^2+14y+8\). Option A is correct. B is the constant corner, obtained from \(2\cdot4\). C is only one mixed contribution, from \(3y\cdot4\). D is the other mixed contribution, from \(2\cdot y\), not their total. A common mistake is to choose one rectangle instead of combining both. Memory cue: for \((ay+b)(y+d)\), the linear term comes from \(ady+by\), so both mixed rectangles must be counted.

Related tags

Linear-TermRectangle-ModelBinomial MultiplicationVisual ModelsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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