12.4 Exercise 101

Find the limits if $\underset{x \rightarrow c}{\lim} f \left(x\right) = −3$ and $\underset{x \rightarrow c}{\lim} g \left(x\right) = 5.$

$\underset{x \rightarrow 0^{+}}{\lim} f \left(x\right) , f \left(x\right) = \left\{\right. \begin{matrix}3 x^{2} + 2 x + 1 \\ 5 x + 3\end{matrix} \textrm{ }\textrm{ } \begin{matrix}x > 0 \\ x < 0\end{matrix}$