[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 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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