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A square has side a+b. Which identity is shown by its area model?

Answer and explanation

Correct answer: a² + 2ab + b²

Direct answer: A is correct. The area of a square equals side × side. Here the side is a+b, so the area is (a+b)². To see the visual model, split the square into four parts: an a by a square with area a², a b by b square with area b², and two rectangles, each measuring a by b and each having area ab. Adding the four parts gives a² + ab + ab + b² = a² + 2ab + b². Option B represents a difference of two squares, not the area of a square whose side is a+b. Option C has only one ab rectangle and therefore misses one equal rectangular part. Option D is the perimeter, 2(a+b), not the area. Memory cue: for a plus b squared, remember square, two middle products, square: a² + 2ab + b².

Related tags

Algebraic IdentitiesArea ModelBinomial SquareVisual MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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