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Which of the following quadratic expressions can be written as a difference of two squares?

Answer and explanation

Correct answer: \(9p^2-25q^2\)

\(9p^2-25q^2=(3p)^2-(5q)^2\), so it is a difference of two squares. Its factorisation is \((3p-5q)(3p+5q)\). Option C is \((3p-5q)^2\), which is a perfect square, not a difference of squares. Exam tip: when two squared terms have a minus sign and no middle term, check the form \(a^2-b^2\).

Related tags

Algebraic IdentitiesQuadratic ExpressionsDifference Of SquaresFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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