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If the quadratic expression \(x^2+px+q\) is a perfect square of a binomial, which relation between \(p\) and \(q\) must hold?

Answer and explanation

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

In \((x+a)^2=x^2+2ax+a^2\), we have \(p=2a\) and \(q=a^2\). Hence \(p^2=(2a)^2=4a^2=4q\). In exams, square the middle coefficient and compare it with \(4q\).

Related tags

Algebraic IdentitiesQuadratic ExpressionsPerfect Square TrinomialBinomial SquareClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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