Let $f$ be defined by $$f(x) = \begin{cases} {3}x^3- 2m, & x \leq -1 \\ {6}x^2 + 5m, & x > -1 \end{cases}$$

(a) Find (in terms of $m$) $\displaystyle{\lim_{x\rightarrow -1^{+}} f(x)}$
Limit =

(b) Find (in terms of $m$) $\displaystyle{\lim_{x\rightarrow -1^{-}} f(x)}$
Limit =

(c) Find the value of $m$ so that $$\lim_{x\rightarrow -1^{-}} f(x) = \lim_{x\rightarrow -1^{+}} f(x)$$
$m$ =