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Which of the following quadratic trinomials is not a perfect-square trinomial?

Answer and explanation

Correct answer: \(x^2+10x+21\)

In a perfect-square trinomial, the middle coefficient is \(2ab\) and the constant is \(b^2\). For \(x^2+10x+21\), \(2\times5=10\), but \(5^2=25\), not 21. Exam tip: check the constant term against the middle term.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPerfect Square TrinomialFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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