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Which of the following expressions is completely factorised by taking out the common factor?

Answer and explanation

Correct answer: 7m(m + 2)

The direct answer is A: 7m(m + 2). Start with the expanded expression represented by the choices: 7m² + 14m. Both terms share 7m, so factor it out: 7m² ÷ 7m = m and 14m ÷ 7m = 2. This gives 7m(m + 2). The bracket m + 2 has no further common numerical factor or common variable, so the factorisation is complete. Option B is still expanded, so its common factor has not been taken out. Option C is only partly factorised because 7m + 14 still has a common factor 7; it can become 7m(m + 2). Option D is also incomplete because m² + 2m still has common factor m; it becomes 7m(m + 2). Memory cue: after factoring, inspect the bracket and continue if every term inside still shares a factor.

Related tags

Complete FactorisationCommon FactorFactorisationAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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