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Which condition correctly identifies the quadratic expression \(x^2+bx+c\), with real coefficients, as a perfect-square trinomial?

Answer and explanation

Correct answer: \(b^2=4c\)

For a perfect square, \(x^2+bx+c=(x+b/2)^2\). Thus the constant term must be \(b^2/4\), giving \(b^2=4c\). Exam tip: equivalently, check whether the discriminant \(b^2-4c\) is zero.

Related tags

Quadratic ExpressionsPerfect Square TrinomialAlgebraic IdentitiesDiscriminantGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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