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For the quadratic expression \(x^2+px+q\), with real coefficients, to be a perfect square of a binomial, which relation between \(p\) and \(q\) is necessary and sufficient?

Answer and explanation

Correct answer: \(p^2=4q\)

If \(x^2+px+q=(x+a)^2\), expanding gives \(x^2+2ax+a^2\). Thus \(p=2a\) and \(q=a^2\), so \(p^2=4q\). Exam tip: compare the square of the middle coefficient with four times the constant term.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPerfect Square TrinomialCoefficient RelationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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