Qual a diferença entre um gráfico de primeiro grau para um de segundo?

Tendo em conta equacoes do tipo y=ax²+bx+c f(x)=x²-6x+8 podemos afirmar que: A) a>0, correcto b>0 errado c>0 correto B) a>0, correto b>0 errado c<0 errado C) a0 errado c0, correto b0 correto resposta correta a D).

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