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What is the greatest common factor when factorising 6x + 9?

Answer and explanation

Correct answer: 3

The correct answer is 3. A common factor must divide every term of the expression. The terms are 6x and 9. The greatest numerical factor common to 6 and 9 is 3, and there is no variable x in the second term, so x cannot be a common factor. Taking out 3 gives 6x + 9 = 3(2x + 3). This confirms that 3 is a factor of both terms and that the expression is correctly factorised. Option B is wrong because 6 does not divide 9. Option C is wrong because 9 does not divide 6x as a numerical factor in general. Option D is wrong because 9 has no factor x. To find a greatest common factor, first find the numerical GCF of the coefficients and then include only variables that occur in every term with the smallest common power.

Related tags

FactorisationGreatest Common FactorCommon FactorsLinear ExpressionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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