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Which of the following trinomials cannot be factorised into a product of two linear binomials with integer coefficients?

Answer and explanation

Correct answer: \(x^2+4x+7\)

For \(x^2+4x+7\), two integers must have product 7 and sum 4. The pair 1 and 7 has sum 8, so no such integer pair exists. In contrast, \(x^2+5x+6=(x+2)(x+3)\). Exam tip: check the required product and sum first.

Related tags

FactorisationAlgebraic IdentitiesQuadratic TrinomialsInteger CoefficientsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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