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For which of the following expressions does taking out a common factor first leave a difference of squares?

Answer and explanation

Correct answer: \(x^3-4x\)

In \(x^3-4x\), take out the common factor \(x\): \(x(x^2-4)\). Now \(x^2-4=x^2-2^2\), a difference of squares. In \(x^3+4x\), the remaining expression is a sum. Exam tip: check the HCF first.

Related tags

FactorisationAlgebraic IdentitiesCommon FactorDifference Of SquaresClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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