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If a visual model has total area \(p^2+2pq+q^2\), what is the side of the whole square?

Answer and explanation

Correct answer: \(p+q\)

The correct answer is B, \(p+q\). Start with the standard identity \((p+q)^2=p^2+2pq+q^2\). The given total area is therefore the square of \(p+q\). Since the area of a square is \((\text{side})^2\), its side must be \(p+q\) (taking the usual non-negative length). Option A is not correct because \((p-q)^2=p^2-2pq+q^2\); its middle term has a minus sign. Option C, \(2pq\), is only the combined area of the two cross-rectangles in the visual model, not the side. Option D is a sum of two square areas and is not the square root of the complete expression. A useful check is to imagine four pieces: \(p^2\), two pieces of area \(pq\), and \(q^2\). Their outer side is obtained by adding the component lengths, giving \(p+q\).

Related tags

Algebraic IdentitiesPerfect Square TrinomialVisual ModelsSquare AreaClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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