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What is the simplest factorised form of 5x²y − 15xy² + 10xy?

Answer and explanation

Correct answer: 5xy(x − 3y + 2)

Correct answer: A, 5xy(x − 3y + 2). Look for the greatest common factor present in every term. The numerical factors 5, 15 and 10 have greatest common factor 5. Each term also contains x and y, so the greatest common monomial factor is 5xy. Divide each term by 5xy: 5x²y ÷ 5xy = x, −15xy² ÷ 5xy = −3y, and 10xy ÷ 5xy = 2. Therefore the factorised form is 5xy(x − 3y + 2). Option B is algebraically equivalent but leaves y inside every term and is not the simplest complete common-factor form. Option C is also equivalent but leaves 5 inside the bracket, so it is not fully extracted. Option D gives twice the original expression. Memory cue: take the greatest common numerical factor and the lowest power of every variable shared by all terms.

Related tags

Common FactorMonomial FactorisationSimplifying ExpressionsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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