Exercise $4[08$ points$].$ The aim of this exercise $($Questions $26-28)$ is to find the value$($s$)$ of $c$ that make the function $f(x)$ continuous at $3.$

$f(x)=\{\begin{array}{ccc}x+2c& if& x3\\ 2x-c^2& if& x>3\end{array}$

Find the following.

$\underset{x3}{lim}f(x)=,\underset{x31}{lim}f(x)=,$ and $f(3)=$

Complete the statement $f(x)$ is continuous at $3$ if

the three values of question $26$ are all $\_\_?$

List the value$($s$)$ of c that make f$($x$)$ continuous at $3$