$$\left. \begin{array} { l } { 3 x ^ { 2 } + 6 x } \\ { + 18 } \end{array} \right.$$
$18x\left(x+2\right)$
$$18=2\times 3^{2}$$
$$18x\left(x+2\right)$$
$$18x^{2}+36x$$
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$3x\left(x+2\right),\ 18$