# How do you find the domain of f(x)=(4+x)/(1-4x)?

$x \in \mathbb{R} , x \ne \frac{1}{4}$
$\text{solve "1-4x=0rArrx=1/4larrcolor(red)" excluded value}$
$\text{domain is } x \in \mathbb{R} , x \ne \frac{1}{4}$