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In which situation will the term 2ab not appear in the area model?

Answer and explanation

Correct answer: When a² − b² is represented by the rectangle (a + b)(a − b)

The correct answer is C. The difference-of-squares identity is (a + b)(a − b) = a² − b². In this rectangle model, the two factors have different signs in their algebraic parts, so there is no pair of positive ab rectangles producing a 2ab term. For A, a square of side a + b has area (a + b)² = a² + 2ab + b², so 2ab appears. For B, a square of side a − b has area a² − 2ab + b², so a middle term still appears, although it is negative. D explicitly contains two ab rectangles, whose combined area is 2ab. Therefore only C has no 2ab term. Memory cue: the difference of squares has only two square terms because the mixed terms cancel.

Related tags

Difference Of SquaresArea ModelMixed TermsAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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