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Which algebraic identity is shown by the area model of a square with side \(a+b\)?

Answer and explanation

Correct answer: \((a+b)^2=a^2+2ab+b^2\)

The correct answer is A. A square with side \(a+b\) has area \((a+b)^2\). Divide each side into parts of lengths \(a\) and \(b\). The large square is then divided into an \(a\) by \(a\) square with area \(a^2\), two rectangles each with area \(ab\), and a \(b\) by \(b\) square with area \(b^2\). Adding these non-overlapping parts gives \((a+b)^2=a^2+ab+ab+b^2=a^2+2ab+b^2\). Option B describes the difference-square identity and has a negative middle term. Option C describes the difference of two squares, represented by a rectangle with sides \(a+b\) and \(a-b\), not this square. Option D is not a valid identity in general; addition and multiplication are different operations. Memory cue: a plus sign in the side produces a plus middle term and two equal \(ab\) rectangles.

Related tags

Algebraic IdentitiesArea ModelSquare ExpansionVisual GeometryClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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