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Which is the correct factorised form of $6a^2b + 9ab^2$?

Answer and explanation

Correct answer: 3ab(2a + 3b)

The direct answer is A. Inspect both terms: $6a^2b$ and $9ab^2$. The greatest common numerical factor of 6 and 9 is 3. Both terms contain a, and both contain b, so the common algebraic factor is $ab$. The greatest common factor is therefore $3ab$. Divide each term by it: $6a^2b\div3ab=2a$ and $9ab^2\div3ab=3b$. Hence $6a^2b+9ab^2=3ab(2a+3b)$. Option B is mathematically equivalent after further simplification, but it is not the complete factorisation because a common factor $b$ remains inside. C is also equivalent but leaves the common numerical factor 3 inside. D has a minus sign and expands to $6a^2b-9ab^2$, not the given sum. A complete factorisation extracts the greatest common factor. Memory cue: compare coefficients, then take the smallest exponent of every variable common to all terms.

Related tags

Common FactorMonomial FactorisationComplete FactorisationFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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