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Which of the following expressions can be factorised by taking a common factor from its two terms?

Answer and explanation

Correct answer: \(7p + 7q\)

Correct answer: C. To take a common factor, look for a factor present in every term. In \(7p+7q\), both terms contain 7, so taking it outside gives \(7p+7q=7(p+q)\). Multiplying back confirms the result. A has no obvious common algebraic factor between \(x^2\) and 9; it is not generally factorised over the usual school-number system by simply taking a common factor. B can be factorised, but by the special identity \(a^2-b^2=(a-b)(a+b)\), not by extracting one common factor from both displayed terms. D is a trinomial and is handled by finding suitable factors of 6 whose sum is 5, not by one common factor shared by all terms. Memory cue: common-factor method means every term must contain the same factor; take it out once and divide each term by it.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsCommon FactorsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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