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What is the factorised form of \(7x+7y+2x+2y\)?

Answer and explanation

Correct answer: \(9(x+y)\)

The direct answer is A: \(9(x+y)\). First group terms that contain the same binomial: \(7x+7y=7(x+y)\) and \(2x+2y=2(x+y)\). Therefore the whole expression becomes \(7(x+y)+2(x+y)\). The common factor is \((x+y)\), so factor it out: \((7+2)(x+y)=9(x+y)\). Expanding A gives \(9x+9y\), which is the same as \(7x+7y+2x+2y\). B expands to \(7xy+7x+2y+2\), introducing terms not present. C also creates unrelated products and does not reproduce the expression. D expands only to \(7x+7y\), leaving out \(2x+2y\). Memory cue: when two groups contain the same bracket, take that entire bracket as the common factor.

Related tags

FactorisationGroupingCommon FactorAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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