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Which of the following quadratic trinomials cannot be expressed as a product of two linear factors with integer coefficients?

Answer and explanation

Correct answer: \(x^2-2x-1\)

For \(x^2-2x-1\), the discriminant is \(b^2-4ac=(-2)^2-4(1)(-1)=8\), which is not a perfect square. Hence its roots are not integers, so it has no linear factorisation with integer coefficients. Exam tip: check whether the discriminant is a perfect square first.

Related tags

FactorisationQuadratic TrinomialsDiscriminantAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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