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Factorise 5xy − 10x + 3y − 6 by grouping.

Answer and explanation

Correct answer: (5x + 3)(y − 2)

The direct answer is A: (5x + 3)(y − 2). In grouping, arrange the four terms into two pairs that have the same binomial factor. Write 5xy − 10x as 5x(y − 2), because 5x is common. Write 3y − 6 as 3(y − 2), because 3 is common. The expression becomes 5x(y − 2) + 3(y − 2). Now take the common factor (y − 2): (5x + 3)(y − 2). Option A is confirmed by expansion: 5xy − 10x + 3y − 6. Option B expands to 5xy + 10x − 3y − 6, so both variable-term signs differ. Option C expands to 5xy − 15x + 2y − 6, which has wrong coefficients. Option D expands to 5xy + 15x − 2y − 6, also incorrect. Memory cue: after grouping, the bracket taken out must be identical in both groups.

Related tags

FactorisationGrouping MethodCommon FactorAlgebraic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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