Let f(x) =
\begin{cases}
-\frac{2}{x+4}, &\text{if}\ x< -4\\
2 x+12, &\text{if}\ x> -4
\end{cases}

Calculate the following limits.

\displaystyle{\lim_{x\to -4^-}f(x)=} help (limits)
\displaystyle{\lim_{x\to -4^+}f(x)=} help (limits)
\displaystyle{\lim_{x\to -4}f(x)=} help (limits)

Calculate the following limits.

You can earn partial credit on this problem.