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What is the factorised form of \(6x+9\)?

Answer and explanation

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

Correct answer: A. Find the greatest common factor of the two terms. The factors of 6x include 3, and 9 is also divisible by 3, so take 3 outside: \(6x+9=3(6x\div3+9\div3)=3(2x+3)\). Expanding A gives \(6x+9\), confirming it. B expands to \(6x+54\), so the second term is too large. C expands to \(9x+54\), changing both coefficients. D expands to \(6x+27\), so its constant term is incorrect. A useful habit is to divide every term by the factor taken outside; do not divide only one term. You can always verify a factorisation by distributing the outside factor across the bracket. Memory cue: the numbers inside the bracket are what remain after dividing each original term by the common factor.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsGrade 9 MathematicsCommon FactorsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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