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In which expression is 3m a common factor of every term?

Answer and explanation

Correct answer: 6m² + 9mn

Answer: A, 6m² + 9mn. A common factor must divide every term, so both its numerical part, 3, and its variable part, m, must occur in every term. In option A, 6m² = 3m × 2m and 9mn = 3m × 3n. Thus the expression can be written as 3m(2m + 3n). Option B fails because 6n has no m factor, even though the first term contains 3m. Option C fails because 3n has no m factor. Option D fails because 9n² has no m factor. Notice that a numerical coefficient alone is not enough; the variable must also be present with at least the required power. Memory cue: test a proposed common factor term by term by dividing each term by it; every quotient must be an algebraic expression without a leftover fraction or variable.

Related tags

Common FactorFactorisationAlgebraic ExpressionsVariablesGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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