Question 36676
find the domain of the following functions by determining which numbers, if any, cannot be used:
1) f(x)=3x^2/(1+3x)

The denominator cannot be zero. 
So x cannot be -1/3. The domain is all Real numbers except x=-1/3


2) f(x)=(x^2+x-2)(x^2+4) 

This denominator is never zero
So, domain is all Real Numbers.

Cheers,
Stan H.