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Which condition is necessary for the expression \(ax^2+bx+c\) to be a quadratic expression in \(x\)?

Answer and explanation

Correct answer: \(a \ne 0\)

A quadratic expression must have 2 as the highest power of \(x\), so the coefficient \(a\) of \(x^2\) must be non-zero. If \(a=0\), the expression becomes at most linear. Exam tip: check the coefficient of the highest power first.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPolynomial DegreeCoefficientClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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