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Why is \(a^2+2ab+b^2\) shown as a complete square in a visual model?

Answer and explanation

Correct answer: Because its parts form a square of side \(a+b\)

The direct answer is option A. A large square can be divided into one square of side \(a\), with area \(a^2\), one square of side \(b\), with area \(b^2\), and two rectangles each having area \(ab\). Adding the four regions gives \(a^2+ab+ab+b^2=a^2+2ab+b^2\). Their outer boundary is a square whose side is \(a+b\), so the same total area is \((a+b)^2\). Option B is wrong because the model has two rectangles, not one. Option C is wrong because \(ab\) is only the area of one mixed rectangle. Option D is wrong because the variables need not be zero. Memory cue: one square, two equal rectangles, and one square form the “square-plus-double-product” pattern.

Related tags

Perfect Square TrinomialVisual ModelBinomial SquareArea IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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