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What is the factorisation of (6pq+9p+4q+6)?

Answer and explanation

Correct answer: (3p+2)(2q+3)

The direct answer is A: (3p+2)(2q+3). Group the terms in pairs: (6pq+9p)+(4q+6). From the first group take out 3p, giving 3p(2q+3). From the second group take out 2, giving 2(2q+3). Both groups now contain the common binomial (2q+3), so factor it out: (3p+2)(2q+3). Expanding A gives 6pq+9p+4q+6, exactly the original expression. B expands to 6pq+18p+4q+12, so the p-term and constant are wrong. C expands to 6pq+18p+8q+24, so several coefficients are wrong. D expands to 6pq+4p+9q+6, which interchanges the required coefficients. The key idea in grouping is not merely to make pairs, but to make the same bracket appear in both groups. Always compare the brackets before taking out the final common factor.

Related tags

Factorisation By GroupingCommon BinomialAlgebraic ExpressionsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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