Find the Value of the Given Limit If It Exists $\infty$

Short Answer

find the value of the given limit if it exists. If the function approaches $\infty$ or $-\infty$ , say so.
- $\lim _{x \rightarrow 5^{-}} f(x)$ where $f(x)= \begin{cases}x^{2}+3 x & \text { if } x \leq 5 \\ 4 x+15 & \text { if } x>5\end{cases}$