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Factorise (6x^2+11x+3).

Answer and explanation

Correct answer: (3x+1)(2x+3)

Direct answer: A, (3x+1)(2x+3). To factor a quadratic, multiply the first and last coefficients: 6×3=18. The two numbers whose product is 18 and sum is 11 are 9 and 2. Thus 11x can be split as 9x+2x: 6x²+9x+2x+3=3x(2x+3)+1(2x+3)=(3x+1)(2x+3). Option A expands to 6x²+9x+2x+3, exactly the given expression. Option B gives 6x²+19x+3, so its middle coefficient is wrong. Option C gives 6x²+9x+6x+3=6x²+15x+3, also wrong. Option D gives 6x²−9x−2x+3=6x²−11x+3, with the wrong sign for the middle term. Memory cue: after factorising, always expand the answer to check the middle term and the constant term.

Related tags

Quadratic FactorisationSplit Middle TermAlgebraic IdentitiesClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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