At What Points C in the Domain of $\lim _{x \rightarrow c} f(x)$

Short Answer

At what points c in the domain of f(x) does $\lim _{x \rightarrow c} f(x)$ exist?
$f(x)=\left\{\begin{array}{l}3 x & -5 \leq x<0 \\1 & x=0\\x^{2}+1& 0 < x \leq 2\\\end{array}\right.$