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What is the constant part in the area model of \((a+1)(a+6)\)?

Answer and explanation

Correct answer: 6

The direct answer is B, 6. In the area model, multiply every part of the first side by every part of the second side: \((a+1)(a+6)=a\cdot a+a\cdot6+1\cdot a+1\cdot6=a^2+6a+a+6=a^2+7a+6\). A constant part contains no variable, so it comes from multiplying the two constant pieces, 1 and 6. Thus the constant term is \(1\cdot6=6\). Option A is only one of the constants, not their product. Option C, 7, is the sum of 1 and 6 and becomes the coefficient of the middle term after combining \(6a+a\). Option D still contains a, so it is not constant. Memory cue: in \((a+p)(a+q)\), the constant term is always \(pq\).

Related tags

Constant TermArea ModelBinomial MultiplicationQuadratic ExpressionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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