Question

Explicite o domínio das funções
f(x)=1/x-6
f(x)= 1/raiz de 8-x

Answer 1

$a) \\ \\ f(x)=\frac{1}{x-6} \\ \\ x-6 \neq 0 \\ x \neq 6 \\ \\ D(f)=R-(6) \\ \\ b) \\ \\ f(x)= \frac{1}{ \sqrt{8-x} } \\ \\ 8-x\ \textgreater \ 0 \\ \\ x\ \textless \ 8 \\ \\ D(f)=R|x\ \textless \ 8$