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When factorising by the grouping method, which feature should be identified after forming groups of terms?

Answer and explanation

Correct answer: A common binomial factor in both groups

The direct answer is A: a common binomial factor in both groups. In grouping, terms are arranged into two or more groups so that each group can be factorised. After taking out a factor from each group, the important test is whether the remaining bracket is identical, including signs. For example, \(x(a+b)+y(a+b)\) contains the common binomial \((a+b)\), so it becomes \((x+y)(a+b)\). Option B is not sufficient because equal exponents do not guarantee that the groups share a factor. Option C is unnecessary; negative terms can also be grouped and factorised. Option D is false because grouping can be used with expressions having different numbers of terms, not only exactly three. The key is to make the same binomial appear in both groups, possibly by taking a negative sign out of one group. Memory cue: group, factor each group, then look for the same bracket.

Related tags

FactorisationGrouping MethodCommon BinomialAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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