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Factorise (3xy-6x+5y-10) by grouping.

Answer and explanation

Correct answer: (3x+5)(y-2)

The correct answer is A: (3x+5)(y-2). Group the expression as (3xy-6x)+(5y-10). Take out the common factor from each group: 3x(y-2)+5(y-2). The binomial (y-2) is common, so the result is (3x+5)(y-2). Expanding option A gives 3xy-6x+5y-10, which matches every term. Option B expands to 3xy+6x-5y-10, changing the signs of the second and third terms. Option C expands to 3xy-15x+2y-10, so its coefficients do not match. Option D expands to 3xy+3x-10y-10, which is also different. The important idea is that the second group must have the same binomial as the first group after taking out its numerical or variable factor. Always expand once as a check.

Related tags

Factorisation By GroupingCommon FactorPolynomialsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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