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

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Answer 1 · 2015-09-15T13:09:35

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

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

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