Question 371753
The domain means allowable values of x...
In the function
{{{f(x)= (x+3) / (x^2 + 8x + 15)}}}
all values are allowed for x, EXCEPT those that make the denominator go to zero...
If we solve the denominator for zero via (x+3)(x+5)=0, we find that x cannot be -3 or -5...
Thus the domain is all real except x cannot be -3 or -5