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Which expression can be factorised using the identity for the difference of two squares?

Answer and explanation

Correct answer: \(9x^2-16y^2\)

\(9x^2-16y^2=(3x)^2-(4y)^2\), so it fits \(a^2-b^2=(a-b)(a+b)\): \((3x-4y)(3x+4y)\). Option B has a sum, not a difference. Exam tip: check for two perfect squares separated by a minus sign.

Related tags

FactorisationAlgebraic IdentitiesDifference Of SquaresClass 9 MathematicsPolynomial ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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