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If an area model of (a²-b²) is made, which part is removed?

Answer and explanation

Correct answer: The square with area b²

The correct answer is B: the square with area b². The expression a²-b² means start with a region of area a² and subtract a region of area b². In a visual model, the larger a-by-a square represents a², and the smaller b-by-b square is the part removed. The remaining region has area a²-b², which can also be factored as (a-b)(a+b). Option A cannot be removed if we want to retain the starting a² region. Option C is only one rectangle of area ab and does not represent the subtracted square in the difference-of-squares model. Option D, 2ab, belongs to the middle contribution in square expansions such as (a+b)² or (a-b)²; it is not the part directly subtracted in a²-b². Memory cue: in “first square minus second square,” remove the second square.

Related tags

Difference Of SquaresRemoved AreaArea ModelFactorisationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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