pre calc
posted by kim .
find the domain of the following functions
f(x)=1/x+ 5/x3

I will assume you mean
f(x) = 1/x + 5/(x3)
the domain would be the set of all real numbers, except x=0 and x=3 
yes

so how do you write the domain as a equation

domain:
x all real except x=0 and x=3