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If a square of side b is removed from a larger square of side a, which algebraic expression represents the remaining L-shaped area?

Answer and explanation

Correct answer: a² − b²

Direct answer: Option A, a²−b². Area is found by subtracting the removed part from the original figure. The larger square has side a, so its area is a·a=a². The removed square has side b, so its area is b·b=b². Therefore the remaining L-shaped area is a²−b². Option B, (a−b)², is the area of a different square whose side itself is a−b; it is not generally the same as the large square with a smaller square removed. Option C adds the two square areas instead of removing one. Option D, 2ab, is the middle part in a square-of-a-sum identity and does not describe this subtraction. Memory cue: remaining area = original area − removed area.

Related tags

Difference Of SquaresVisual ModelsArea SubtractionAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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