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Which is the factorised form of 3a + 6?

Answer and explanation

Correct answer: 3(a + 2)

Answer: B, 3(a+2). Look for the greatest common factor of all terms. Both 3a and 6 are divisible by 3, so take 3 outside the bracket: 3a+6=3(a+2). Expanding verifies the result: 3(a+2)=3a+6. A is wrong because it removes the factor 3 from the first term but leaves the constant unchanged, so a+6 is not equal to 3a+6. C is wrong because 6(a+3)=6a+18, which is much larger and has different coefficients. D is wrong because 3(a−2)=3a−6; the sign of the constant changes. The reliable method is to divide every original term by the common factor and place the resulting terms inside parentheses. Memory cue: factoring is the reverse of distributing; multiplying the outside factor back must reproduce every original term exactly.

Related tags

Common FactorFactorisationDistributive PropertyAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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