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A square has side a. A corner square of b × b is removed. The remaining area is related to which expression?

Answer and explanation

Correct answer: a² − b²

Direct answer: D is correct. Begin with the area of the large square: side a gives area a². The removed corner is a smaller square with side b, so its area is b². The remaining area is found by subtracting the removed part from the original part: a² − b². Option A adds the small square instead of removing it. Option B is the area of two rectangles with dimensions a and b in a different visual model; it is not the result of subtracting one square from another. Option C is the expansion associated with a square whose side is a+b, not a large square with a b-by-b corner removed. Option D correctly represents “large area minus removed area.” Memory cue: when a region is cut out, use subtraction; difference of squares is a²−b².

Related tags

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

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