Use factoring to find the simplified product of these rational expressions.
$\begin{array}{c}
\frac{x^2+7 x+10}{x^2+7 x+12} \cdot \frac{x^2+9 x+18}{x^2+3 x-10} \\
\frac{(x+2)(x+[?])}{(x+)(x-2)}
\end{array}$
$\begin{array}{c}
\frac{x^2+7 x+10}{x^2+7 x+12} \cdot \frac{x^2+9 x+18}{x^2+3 x-10} \\
\frac{(x+2)(x+[?])}{(x+)(x-2)}
\end{array}$