# How do you find the domain of #f(x) = ( 9x+8)/(-9-8x)#?

##### 1 Answer

May 13, 2015

Start by finding the 'forbidden' values of

The denominator of a fraction may not be zero, so let's see when it is:

**Answer** :

This forms a *vertical asymptote*:

graph{(9x+8)/(-9-8x) [-10, 10, -5, 5]}

**Extra** : as you can see, there is also a horizontal asymptote at

*range* of this function