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In a visual square model of an algebraic identity, if there is one region of area \(a^2\), one region of area \(b^2\), and two equal rectangular regions of area \(ab\), which identity does it represent?

Answer and explanation

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

Direct answer: A is correct. Add the areas of all four regions in the square model: one region contributes \(a^2\), one contributes \(b^2\), and the two equal rectangles contribute \(ab+ab=2ab\). The total is therefore \(a^2+2ab+b^2\). By the square-of-a-sum identity, this equals \((a+b)^2\). B is wrong because a square of a difference has negative rectangular contributions, \(a^2-2ab+b^2\). C is incomplete because it leaves out both \(ab\) rectangles. D represents a difference of squares, which has a different structure and no middle \(2ab\) term. A useful memory cue is that two positive cross-rectangles mean plus \(2ab\); two negative cross-rectangles mean minus \(2ab\).

Related tags

Square ModelAlgebraic IdentitiesBinomial SquareArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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