\(\underrightarrow{x~\hbox{approaches –3 from the left}}\)
\(\underleftarrow{x~\hbox{approaches –3 from the right}}\)
\(x\)
\(-3.5\)
\(-3.1\)
\(-3.01\)
\(\rightarrow \)
\(-3\)
\(\leftarrow \)
\(-2.99\)
\(-2.9\)
\(-2.5\)
\(f(x)=\dfrac{x^{2}-9}{x+3}\)