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Under which condition is the equation \(ax^2+bx+c=0\) called a quadratic equation?

Answer and explanation

Correct answer: \(a\neq 0\)

By definition a quadratic equation has degree 2, so the coefficient of \(x^2\) must be nonzero, i.e. \(a\neq 0\). If \(a=0\) the equation reduces to the linear form \(bx+c=0\). Options C and D (\(b=0\) or \(c=0\)) are only special cases but do not prevent the equation from being quadratic as long as \(a\neq 0\). Exam tip: always check the coefficient of \(x^2\) to decide if an equation is quadratic.

Related tags

Quadratic EquationsDegree Of PolynomialCoefficientsStandard FormIntroduction To Quadratic EquationsMathematicsClass 10 Mcq

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