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Using grouping, what is the factorised form of (ax+ay+bx+by)?

Answer and explanation

Correct answer: (a+b)(x+y)

The direct answer is B: (a+b)(x+y). Group the four terms in pairs: ax+ay+bx+by=(ax+ay)+(bx+by). Take the common factor from each group: ax+ay=a(x+y), and bx+by=b(x+y). The expression becomes a(x+y)+b(x+y). Now the binomial (x+y) is common to both terms, so take it out: (a+b)(x+y). Expanding verifies the result: (a+b)(x+y)=ax+ay+bx+by. A is only an intermediate grouped form, not the fully factorised form. C expands to ab+ax+by+xy, which is different. D expands to abx+aby and loses the separate terms, so it cannot equal the original expression. The useful memory cue is: group terms so that the same bracket appears twice, then take that bracket common.

Related tags

FactorisationGroupingCommon BinomialExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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