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What is the complete factorisation of (3x²+6x+3)?

Answer and explanation

Correct answer: 3(x+1)²

The direct answer is A: 3(x+1)². First take the greatest common numerical factor, 3, from all terms: 3x²+6x+3=3(x²+2x+1). Now examine the trinomial inside the brackets. It has the form x²+2·x·1+1², so by A²+2AB+B²=(A+B)², it becomes (x+1)². Therefore the complete factorisation is 3(x+1)². Option B would expand as 3(x²+4x+4)=3x²+12x+12, so both the middle and constant terms are wrong. Option C expands to 9x²+6x+1 and has a different leading coefficient and constant term. Option D gives 3(x²−2x+1), whose middle term is negative, not positive. The phrase complete factorisation means that no further common factor or applicable identity remains. Always expand the final answer to verify it.

Related tags

Complete FactorisationCommon FactorPerfect Square TrinomialAlgebraic IdentitiesClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematics

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