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What is the complete factorised form of (3x^2-12)?

Answer and explanation

Correct answer: 3(x-2)(x+2)

Direct answer: A, \(3(x-2)(x+2)\). First inspect all terms and take out the common factor 3: \(3x^2-12=3(x^2-4)\). The expression inside is a difference of squares because \(x^2-4=x^2-2^2\). Apply \(A^2-B^2=(A-B)(A+B)\), giving \(x^2-4=(x-2)(x+2)\). Hence the complete factorisation is \(3(x-2)(x+2)\). Option B would represent \(3(x^2-16)=3x^2-48\), not the given expression. Option C stops after extracting 3, so it is not complete because \(x^2-4\) can still be factorised. Option D represents \(3(x^2-4x+4)\), which contains an extra \(-4x\) term. The important habit is to look for a common numerical factor first and then check whether the remaining expression is a familiar identity.

Related tags

Common FactorDifference Of SquaresComplete FactorisationAlgebraic IdentitiesFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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