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If x²−4 is viewed visually, which small square has been removed?

Answer and explanation

Correct answer: A square with side 2

Direct answer: B, the square with side 2. The term x² represents a large square whose side is x. Subtracting 4 means removing a smaller square with area 4. Since the area of a square is side×side, its side must satisfy side²=4, so the positive side length is 2. This also appears in the identity x²−4=x²−2²=(x−2)(x+2). A is wrong because side 4 gives area 16, not 4. B is correct because 2²=4. C and D are factors in the resulting factorisation, not the side of the constant square that was removed. In a geometric interpretation, lengths are taken as non-negative. Memory cue: first rewrite the subtracted number as a square: 4=2².

Related tags

Difference-Of-SquaresRemoved-SquareVisual-FactorisationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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