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In the rectangle model of \((a+2)(a+5)\), what is the area of the constant corner?

Answer and explanation

Correct answer: \(10\)

The correct answer is C: \(10\). In an area model for \((a+2)(a+5)\), one side is divided into lengths \(a\) and \(2\), while the other is divided into \(a\) and \(5\). The constant corner is formed by the two constant lengths, 2 and 5. Its area is therefore \(2\times5=10\). Full expansion gives \((a+2)(a+5)=a^2+5a+2a+10=a^2+7a+10\), confirming that the constant term is 10. Option A is only one side length, not an area. Option B is the other side length, also not an area. Option D is \(2+5\), which is a sum rather than the corner area. Memory cue: the constant term in a product of binomials comes from multiplying the two constant parts.

Related tags

Rectangle ModelConstant TermBinomial MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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