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Choose the correct factorised form of (2ab+3a+4b+6).

Answer and explanation

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

The correct answer is A: (a+2)(2b+3). Use grouping: 2ab+3a+4b+6 can be written as a(2b+3)+2(2b+3). Both groups contain the common binomial (2b+3), so factor it out to obtain (a+2)(2b+3). Expanding option A gives 2ab+3a+4b+6, exactly the original expression. Option B expands to 2ab+2a+6b+6, so both the a and b coefficients are wrong. Option C expands to 2ab+6a+4b+12, giving incorrect a and constant terms. Option D expands to 2ab+4a+3b+6, so the middle coefficients are interchanged. A useful habit is to group the first two and last two terms, then check whether the binomial factors match. Finally expand the selected product to confirm it.

Related tags

FactorisationGrouping TermsCommon BinomialExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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