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To which of the following expressions can the identity \(a^2-b^2=(a+b)(a-b)\) be applied directly?

Answer and explanation

Correct answer: \((3x+5)(3x-5)\)

In \((3x+5)(3x-5)\), the two factors have the same terms with opposite signs. Thus take \(a=3x\) and \(b=5\) in the difference-of-squares identity. Exam tip: check for identical terms and opposite signs first.

Related tags

Algebraic IdentitiesDifference Of SquaresBinomial FactorsClass 9 MathematicsIdentity RecognitionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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