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3.2E: Domínio e alcance (exercícios)

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    186994

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    Para os exercícios a seguir, encontre o domínio de cada função, expressando as respostas usando a notação de intervalo.

    20. \(f(x)=\frac{2}{3 x+2}\)
    21. \(f(x)=\frac{x-3}{x^{2}-4 x-12}\)
    22. \(f(x)=\frac{\sqrt{x-6}}{\sqrt{x-4}}\)
    23. Faça um gráfico dessa função por partes:\(f(x)=\left\{\begin{array}{ll}x+1 & x<-2 \\ -2 x-3 & x \geq-2\end{array}\right.\)