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Which common factor should be taken out first from (3x²+6x+3)?

Answer and explanation

Correct answer: 3

The direct answer is A: 3. To find a common factor, inspect every term: 3x², 6x, and 3. The number 3 divides all three coefficients, so 3 is a common factor. However, x is not present in the last term 3, so x and 3x cannot be common factors of all terms. Also, 6 does not divide the coefficient 3, so 6 is not common. Taking out 3 gives 3x²+6x+3=3(x²+2x+1), after which the bracket can be recognised as (x+1)². Thus removing 3 is the correct first step and makes the remaining factorisation simple. Option B fails because x cannot be divided out from the constant term. Option C fails numerically. Option D fails for both reasons. Memory cue: a common factor must divide every term without leaving fractions or missing variables.

Related tags

Common FactorThree TermsFactorisationPerfect Square TrinomialClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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