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Factorise (2xy+6x+5y+15) by grouping.

Answer and explanation

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

The direct answer is option B: (2x+5)(y+3). Group the terms as (2xy+6x)+(5y+15). From the first group take 2x common: 2x(y+3). From the second group take 5 common: 5(y+3). The repeated bracket is (y+3), so factor it out: (2x+5)(y+3). Option B expands to 2xy+6x+5y+15, exactly the original expression. Option A expands to 2xy+3x+10y+15, so its middle terms do not match. Option C expands to 2xy+10x+3y+15, again with the coefficients interchanged. Option D expands to 2xy+5x+6y+15, so it is also different. The method is called factorisation by grouping: arrange terms so each pair produces the same bracket. Memory cue: after factoring each pair, look for one identical binomial; take it out only once.

Related tags

Factorisation By GroupingCommon BracketAlgebra

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