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Factorise (xy+2x+3y+6).

Answer and explanation

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

Direct answer: A, (x+3)(y+2). To factorise by grouping, arrange the four terms in two pairs: xy+2x and 3y+6. Take the common factor from each pair: xy+2x=x(y+2), while 3y+6=3(y+2). Thus the expression becomes x(y+2)+3(y+2). The same bracket, (y+2), occurs in both terms, so take it out: (x+3)(y+2). Option A is correct because expansion gives xy+2x+3y+6. Option B expands to xy+3x+2y+6, so the coefficients of x and y are interchanged. Option C gives xy-2x-3y+6, with incorrect signs. Option D gives xy-2x+3y-6, also incorrect. Memory cue: pair terms so that one identical bracket appears twice, then take that bracket common.

Related tags

FactorisationGroupingCommon BinomialClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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