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If \(a>0\) and \(c>0\) in the quadratic expression \(ax^2+bx+c\), which condition is necessary for it to be written as the square of a linear binomial?

Answer and explanation

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

Expanding \((px+q)^2\) gives \(p^2x^2+2pqx+q^2\). Thus \(a=p^2\), \(b=2pq\), and \(c=q^2\), so \(b^2=4ac\). Exam tip: square the middle coefficient and compare it with \(4ac\).

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPerfect Square TrinomialDiscriminant ConditionClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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