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Which of the following expressions can be factorised directly using the identity for the difference of two squares, without rearranging its terms?

Answer and explanation

Correct answer: \(9a^2-25b^2\)

\(9a^2-25b^2=(3a)^2-(5b)^2\), so it factors as \((3a-5b)(3a+5b)\). Option C is a perfect-square trinomial, not a difference of squares. Exam tip: check for two squares separated by a minus sign.

Related tags

FactorisationAlgebraic IdentitiesDifference Of SquaresPerfect Square TrinomialClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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