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Which of the following quadratic trinomials can be factorised as a product of two linear binomials with integer coefficients?

Answer and explanation

Correct answer: \(6x^2+11x+3\)

The direct answer is A: \(6x^2+11x+3=(3x+1)(2x+3)\). To use middle-term splitting, multiply the leading and constant coefficients: \(6\times3=18\). We need two integers whose product is 18 and whose sum is 11; they are 9 and 2. Split the middle term: \(6x^2+9x+2x+3\). Grouping gives \(3x(2x+3)+1(2x+3)=(3x+1)(2x+3)\). Checking the other choices by possible factor pairs of 18 shows no pair produces the required middle coefficient 10, 9, or 8 together with the necessary grouping into integer binomials. The important procedure is: calculate \(ac\), find a pair with sum \(b\), split the middle term, and factor by grouping. Always expand the final answer to verify it.

Related tags

FactorisationMiddle-Term SplittingQuadratic TrinomialsInteger CoefficientsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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