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What will be the factorisation of \(3x+3y\)?

Answer and explanation

Correct answer: \(3(x+y)\)

Answer: A, \(3(x+y)\). Factorisation means rewriting an expression as a product. Look at the two terms, \(3x\) and \(3y\). Both contain the common factor 3. Divide each term by 3: \(3x\div3=x\) and \(3y\div3=y\). Therefore, taking 3 outside the bracket gives \(3x+3y=3(x+y)\). Option A is correct because expanding it gives \(3x+3y\), exactly the original expression. Option B is wrong because \(3(x-y)=3x-3y\), which changes the plus sign to a minus sign. Option C is wrong because expanding it gives \(3x+xy\), not the given expression. Option D gives \(3y+xy\), so it is also not equivalent. Memory cue: when the same positive number multiplies every term, divide every term by that number and place the number outside the bracket. Always expand once to check.

Related tags

FactorisationCommon FactorAlgebraic ExpressionsGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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