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A função quadrática, ou do 2º grau, é definida pela fórmula \(f(x) = ax^2 + bx + c\), onde \(a, b\) e \(c\) são números reais e \(a \neq 0\). Seu gráfico é uma parábola, cuja concavidade depende do sinal de '\(a\)': para cima se \(a>0\), para baixo se \(a<0\). Pontos chave incluem o vértice (\(V\)) e as raízes (zeros).