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If a square is represented by the parts r², 2rs, and s², what is its side?

Answer and explanation

Correct answer: r+s

Direct answer: A, r+s. Divide each side of the large square into lengths r and s. The four regions are an r by r square of area r², two r by s rectangles whose combined area is 2rs, and an s by s square of area s². Therefore the whole area is r²+2rs+s², which equals (r+s)². The side of the complete square is consequently r+s. B would give (r−s)²=r²−2rs+s², so its middle term is negative and does not match the model. C is only a product of r and s; it is not the sum of the two side segments. D would produce a different square and different terms. Memory cue: a positive doubled middle term indicates the sum of the two component lengths.

Related tags

Square-Of-SumArea-ModelBinomial-IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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