\(\lim\limits_{x\rightarrow-2}\frac{\sqrt{3x+10}-2-\left(x+2\right)}{x+2}=\lim\limits_{x\rightarrow-2}\frac{\frac{3\left(x+2\right)}{\sqrt{3x+10}+2}-\left(x+2\right)}{x+2}=\lim\limits_{x\rightarrow-2}\left(\frac{3}{\sqrt{3x+10}+2}-1\right)=-\frac{1}{4}\)
\(\Rightarrow\lim\limits_{x\rightarrow-2}f\left(x\right)=f\left(-2\right)\)
\(\Rightarrow f\left(x\right)\) liên tục tại \(x=-2\)