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Which of the following expressions is a correct example of the identity for the difference of two squares?

Answer and explanation

Correct answer: \(p^2-q^2=(p+q)(p-q)\)

The difference-of-squares identity is \(p^2-q^2=(p+q)(p-q)\), so option C is correct. In option D, the sign is wrong: expanding gives cancellation of middle terms and leaves \(-q^2\). Exam tip: when you see a difference of squares, look for factors formed by the sum and difference.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsPolynomial IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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