[size=150]Qualquer função f, de domínio IR, definida por uma expressão do tipo:[br][img]data:image/png;base64,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[/img][br]em que a , h e k são números reais e a[math]\ne0[/math] designa-se por [b]função quadrática[/b] (Ou polinomial do 2.⁰ grau). 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