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Choose the correct factorisation of (5m - 15).

Answer and explanation

Correct answer: 5(m - 3)

Answer: D, 5(m - 3). Both terms, 5m and -15, have 5 as a common factor. Divide each term by 5: 5m ÷ 5 = m and -15 ÷ 5 = -3. Therefore, taking 5 outside gives 5(m - 3). We can verify it by distributing 5: 5 × m + 5 × (-3) = 5m - 15, which is the original expression. Option A, 5(m + 3), expands to 5m + 15, so its sign is wrong. Option B, 15(m - 5), expands to 15m - 75, so neither coefficient is correct. Option C, m(5 - 15), expands to 5m - 15m, which is not the given expression. Memory cue: when a positive common factor is taken out, retain the negative sign inside the bracket.

Related tags

FactorisationCommon FactorNegative SignAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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