Example 2. Find the third-order derivative of the function $y=x^{2}+3 x+2$.
Solution. Differentiating successively, we obtain:

$$
\begin{gathered}
y^{\prime}=\left(x^{2}+3 x+2\right)^{\prime}=2 x+3 ; y^{\prime \prime}=(2 x+3)^{\prime}=2 \\
y^{\prime \prime \prime}=(2)^{\prime}=0
\end{gathered}
$$