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What is the factorisation of 2xy + 6x + 5y + 15?

Answer and explanation

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

The direct answer is A: (2x + 5)(y + 3). Use grouping. Put the first two terms together and the last two together: 2xy + 6x + 5y + 15 = 2x(y + 3) + 5(y + 3). Both groups contain the same bracket, (y + 3). Taking it common gives (y + 3)(2x + 5), which is the same as option A. Verify by multiplication: 2x·y + 2x·3 + 5·y + 5·3 = 2xy + 6x + 5y + 15. Option B expands to 2xy + 10x + 3y + 15, so coefficients do not match. Option C gives 2xy + 3x + 10y + 15. Option D gives negative middle terms. Memory cue: in grouping, the repeated bracket is the key signal.

Related tags

GroupingFactorisationCommon BinomialExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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