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In a model, the remaining area is s² − 25. It can be the difference of which big and small squares?

Answer and explanation

Correct answer: Squares with sides s and 5

The direct answer is option A. The area of a square equals the square of its side. A large square with side s has area s². A small square with side 5 has area 5² = 25. Subtracting the small area from the large area gives s² − 25, exactly the expression in the question. Option A therefore describes the correct model. Option B would give s² − 25² = s² − 625, because 25 is being treated as a side rather than as an area. Option C names two lengths whose product is (s + 5)(s − 5) = s² − 25, but it does not describe the difference of the areas of squares with those sides. Option D would give (5s)² − s² = 24s². Memory cue: in a difference-of-squares area model, square each stated side before subtracting.

Related tags

Difference Of SquaresVisual ModelsSquare AreaAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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