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For which of the following products does the difference-of-squares identity apply?

Answer and explanation

Correct answer: \((p+q)(p-q)\)

Binomials with the same terms but opposite signs give \((p+q)(p-q)=p^2-q^2\), so A is correct. \((p+q)^2\) is a perfect square and contains the middle term \(2pq\). Exam tip: first check for opposite signs.

Related tags

Algebraic IdentitiesDifference Of SquaresBinomial ProductsGrade 9 MathematicsPolynomial IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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