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What is the factorisation of (6xy+9xz)?

Answer and explanation

Correct answer: 3x(2y+3z)

The direct answer is A: 3x(2y+3z). Find the greatest common factor of 6xy and 9xz. The numerical greatest common factor of 6 and 9 is 3, and x appears in both terms, so the common factor is 3x. Divide each term by 3x: 6xy÷3x=2y and 9xz÷3x=3z. Therefore, 6xy+9xz=3x(2y+3z). Check by distribution: 3x·2y=6xy and 3x·3z=9xz, recovering both original terms. Option B would expand to 6xy+27xz, so the second coefficient is wrong. Option C expands to 18xy+9xz, so the first coefficient is wrong. Option D expands to 18xy+9xz as well, and 9 is not the greatest common numerical factor in the required bracket form. The safest method is divide every term by the factor taken outside.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsVariablesGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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