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

Answer and explanation

Correct answer: As two rectangles with side lengths \(a\) and \(b\)

Answer: A, two rectangles with side lengths \(a\) and \(b\). Imagine a large square whose side is split into parts \(a\) and \(b\) in both directions. The four regions are an \(a\times a\) square with area \(a^2\), two \(a imes b\) rectangles each with area \(ab\), and a \(b imes b\) square with area \(b^2\). The two equal rectangles together have area \(ab+ab=2ab\). Therefore option A correctly represents the mixed term. B represents only \(a^2\), and C represents only \(b^2\). D is not the small corner region; a square of side \(a+b\) would be the entire large square, not one part. Memory cue: the coefficient 2 appears because there are two identical cross-rectangles, not because one rectangle has area \(2ab\).

Related tags

Algebraic IdentitiesVisual ModelsArea ModelMixed TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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