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{{Short description|Polynomial function of degree two}}
{{not to be confused with|Quartic function}}
In [[mathematics]], a '''quadratic function''' of a single [[variable (mathematics)|variable]] is a [[function (mathematics)|function]] of the form<ref name="wolfram">{{cite web |last=Weisstein |first=Eric Wolfgang |title=Quadratic Equation |url=https://mathworld.wolfram.com/QuadraticEquation.html |access-date=2013-01-06 |website=[[MathWorld]]}}</ref>
:<math>f(x)=ax^2+bx+c,\quad a \ne 0,</math>
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