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In a visual model of \((a+b)^2=a^2+2ab+b^2\), how is the \(2ab\) part usually represented?

Answer and explanation

Correct answer: Two rectangles, each \(a\times b\)

The direct answer is C: two rectangles, each measuring \(a\times b\). Imagine a square whose side is split into lengths \(a\) and \(b\) in both directions. The partition creates one \(a\times a\) square with area \(a^2\), one \(b\times b\) square with area \(b^2\), and two remaining rectangles. Each remaining rectangle has dimensions \(a\) and \(b\), so each area is \(ab\). Together they contribute \(ab+ab=2ab\). Option A represents only the \(a^2\) corner square. Option B represents only the \(b^2\) corner square. Option D describes the whole square itself, whose area is the entire left-hand side, not just the middle part. Memory cue: the coefficient 2 means that two identical \(ab\) rectangles are present.

Related tags

Algebraic IdentitiesVisual ModelsArea Model2AbVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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