Question

What is the domain of `f(x)=(x^2+2x)/(x+1)`?

Answer 1

`D_f=(-oo,-1)uu(-1,+oo)`

Explanation:

Given function is defined when we can divide with `x+1` so:
`x+1!=0`
`x!=-1`
`D_f=(-oo,-1)uu(-1,+oo)`