f(x) = √x g(x) = 1/(x - 4)
[tex](f\text{ o g)(x) =}\sqrt[]{\frac{1}{x-4}}[/tex]
Domain of (f o g)(x) ==> 4 < x < +inf ==> x > 4
[tex](g\text{ o f)(x) = }\frac{1}{\sqrt[]{x}\text{ - 4}}[/tex]
Doamain of (g o f)(x) ==> x >= 0, x different of 16
[tex]x\ge0\text{ and x}\ne16[/tex]
